Changelog

This emergency release introduces two new rules to detect nginx heap buffer overflow and heap spray exploitation attempts targeting the rewrite module's is_args stale-state bug (CVE-2026-42945).

Key Findings

CVE-2026-42945: nginx Heap Buffer Overflow via Stale is_args in Rewrite Module

Successful exploitation allows remote attackers to trigger a heap buffer overflow in nginx's rewrite module by sending crafted URIs containing escapable characters. A length/copy pass mismatch in ngx_http_script_copy_capture_code() causes the copy pass to write escaped data into an undersized buffer, leading to heap corruption. This enables denial of service (worker process crash) and, with heap feng shui techniques, potential remote code execution.

We strongly recommend upgrading to nginx 1.30.1 (or later) immediately to address the underlying vulnerability. If you cannot upgrade immediately, avoid rewrite directives with ? in the replacement string followed by set or if referencing capture groups.

In your Worker's dashboard, there is now a dedicated Domains tab where you can purchase a new domain through Cloudflare Registrar and have it automatically connected, add an existing domain, and manage all of your Worker's routing in one place.

You can also enable or disable your workers.dev subdomain and Preview URLs, put them behind Cloudflare Access to require sign-in, and jump directly to analytics or domain overview for any connected domain.

To get started, go to Workers & Pages, select a Worker, and open the Domains tab.

The latest release of the Agents SDK ↗ brings more reliable chat recovery, fixes Agent state synchronization during reconnects, adds durable submissions for Think, exposes routing retry configuration, and adds connection control for Voice agents.

@cloudflare/ai-chat now keeps server turns running when a browser or client stream is interrupted. This is useful for long-running AI responses where users refresh the page, close a tab, or temporarily lose connection. Calling stop() still cancels the server turn.

Set cancelOnClientAbort: true if browser or client aborts should also cancel the server turn:

const chat = useAgentChat({
	agent: "assistant",
	name: "user-123",
	cancelOnClientAbort: true,
});

const chat = useAgentChat({
	agent: "assistant",
	name: "user-123",
	cancelOnClientAbort: true,
});

Notable bug fixes:

• Chat stream resume negotiation no longer throws when replay races with a closed WebSocket connection.
• Recovered chat continuations no longer leave useAgentChat stuck in a streaming state when the original socket disconnects before a terminal response.
• Approval auto-continuation preserves reasoning parts and persists continuation reasoning in the final message.
• isServerStreaming now resets correctly when a resumed stream moves from the fallback observer path to a transport-owned stream.

agents@0.12.4 prevents duplicate initial state frames during WebSocket connection setup. This avoids stale initial state messages overwriting state updates already sent by the client.

Agent recovery is also more reliable when tool calls span a Durable Object restart. Recovery now defers user finish hooks until after agent startup and isolates hook failures, so one failed hook does not block other recovered runs from finalizing.

getAgentByName() now supports routingRetry for transient Durable Object routing failures:

import { getAgentByName } from "agents";

const agent = await getAgentByName(env.AssistantAgent, "user-123", {
	routingRetry: {
		maxAttempts: 3,
	},
});

import { getAgentByName } from "agents";

const agent = await getAgentByName(env.AssistantAgent, "user-123", {
	routingRetry: {
		maxAttempts: 3,
	},
});

@cloudflare/think now supports durable programmatic submissions. submitMessages() provides durable acceptance, idempotent retries, status inspection, cancellation, and cleanup for server-driven turns that should continue after the caller returns.

Think.chat() RPC turns now run inside chat recovery fibers and persist their stream chunks. Interrupted sub-agent turns can recover partial output instead of starting over.

ChatOptions.tools has been removed from the TypeScript API. Define durable tools on the child agent or use agent tools for orchestration. Runtime options.tools values passed by legacy callers are ignored with a warning.

@cloudflare/think no longer applies pruneMessages({ toolCalls: "before-last-2-messages" }) to model context by default. The previous default could strip client-side tool results from longer multi-turn flows.

truncateOlderMessages still runs as before, so context cost remains bounded. Subclasses that relied on the old aggressive pruning can opt back in from beforeTurn:

import { Think } from "@cloudflare/think";
import { pruneMessages } from "ai";

export class MyAgent extends Think {
	beforeTurn(ctx) {
		return {
			messages: pruneMessages({
				messages: ctx.messages,
				toolCalls: "before-last-2-messages",
			}),
		};
	}
}

import { Think } from "@cloudflare/think";
import { pruneMessages } from "ai";

export class MyAgent extends Think<Env> {
	beforeTurn(ctx) {
		return {
			messages: pruneMessages({
				messages: ctx.messages,
				toolCalls: "before-last-2-messages",
			}),
		};
	}
}

@cloudflare/voice adds an enabled option to useVoiceAgent. React apps can now delay creating and connecting a VoiceClient until prerequisites such as capability tokens are ready.

const voice = useVoiceAgent({
	agent: "MyVoiceAgent",
	enabled: Boolean(token),
});

const voice = useVoiceAgent({
	agent: "MyVoiceAgent",
	enabled: Boolean(token),
});

This release also fixes Workers AI speech-to-text session edge cases and withVoice text streaming from AI SDK textStream responses.

• Streamable HTTP routing — Server-to-client requests now route through the originating POST stream when no standalone SSE stream is available.
• Structured tool output — Tool output shapes are preserved when truncating older messages or oversized persisted rows.
• Non-chat Think tool steps — Think agent-tool children can complete without emitting assistant text and can return structured output through getAgentToolOutput.
• Sub-agent schedules — Stale sub-agent schedule rows are pruned when their owning facet registry entry no longer exists.
• @cloudflare/codemode — Adds a browser-safe export with an iframe sandbox executor and resolves OpenAPI specs inside the sandbox to avoid Worker Loader RPC size limits.

To update to the latest version:

npm i agents@latest @cloudflare/ai-chat@latest @cloudflare/think@latest @cloudflare/voice@latest

Refer to the Agents API reference and Chat agents documentation for more information.

Cloudflare has updated Logpush datasets:

• Email Security Post-Delivery Events: A new dataset with fields including AlertID, CompletedAt, Destination, FinalDisposition, Folder, From, FromName, MessageID, MessageTimestamp, MicrosoftTenantID, Operation, PostfixID, Reasons, Recipient, RequestedAt, RequestedBy, RequestedDisposition, Status, Subject, Success, and To.
• Magic Network Monitoring Flow Logs: A new dataset with fields including AWSVPCFlowJSON, Bits, DestinationAS, DestinationAddress, DestinationPort, DeviceID, EgressBits, EgressPackets, Ethertype, FlowProtocol, FlowTimestamp, NumFlows, PacketID, Packets, Protocol, RuleIDs, SampleRate, SampleRateType, SamplerAddress, SourceAS, SourceAddress, SourcePort, TcpFlags, and Timestamp.

• Firewall events (added): AISecurityInjectionScore, AISecurityPIICategories, AISecurityTokenCount, and AISecurityUnsafeTopicCategories.
• HTTP requests (added): AISecurityInjectionScore, AISecurityPIICategories, AISecurityTokenCount, AISecurityUnsafeTopicCategories, and Subrequests.

For the complete field definitions for each dataset, refer to Logpush datasets.

The /cdn-cgi/rum beacon endpoint now returns 405 Method Not Allowed for non-POST requests instead of 404 Not Found. The response includes an Allow: POST, OPTIONS header per RFC 9110 §15.5.6 ↗.

Previously, sending a GET or other non-POST request to this endpoint returned a 404, which was misleading because it suggested the endpoint did not exist. The new 405 response clearly indicates that the endpoint exists but only accepts POST requests.

The Web Analytics beacon (beacon.min.js) already uses POST for all metric submissions, so this change does not affect normal beacon operation. OPTIONS requests for CORS preflight continue to work as before.

For more information, refer to the Web Analytics FAQ.

The Access login page and one-time password (OTP) page now feature a refreshed design that improves visual consistency, user trust, and mobile responsiveness.

Before:

After:

The updated login experience includes:

• Unified authentication card - All sign-in options (identity provider buttons, email input, OTP) now appear in a single card with consistent styling, replacing the previous multi-section layout.
• Consistent button styling - Identity provider buttons use a uniform size and layout for easier scanning and selection.
• Better mobile experience - Responsive layout improvements ensure the login page renders correctly on phones and tablets.
• Dark mode support - The login page now supports dark mode.

New Magic Transit and Cloudflare WAN accounts are now assigned a single IPv4 anycast address by default.

Cloudflare handles failures on its network automatically by advertising your endpoint IP from multiple nodes across many globally distributed data centers. To handle failures on your network, configure two tunnels from separate routers.

To request additional anycast IP addresses for your account, contact your account team.

For tunnel configuration guidance, refer to Configure tunnel endpoints for Cloudflare WAN or Configure tunnel endpoints for Magic Transit.

SSH through Wrangler is now enabled by default for Containers. Previously, you had to set ssh.enabled to true in your Container configuration before you could connect.

This change does not expose any publicly accessible ports on your Container. The SSH service is reachable only through wrangler containers ssh, which authenticates against your Cloudflare account. You also need to add an ssh-ed25519 public key to authorized_keys before anyone can connect, so enabling SSH alone does not grant access.

To connect, add a public key to your Container configuration and run wrangler containers ssh <INSTANCE_ID>:

{
	"containers": [
		{
			"authorized_keys": [
				{
					"name": "<NAME>",
					"public_key": "<YOUR_PUBLIC_KEY_HERE>",
				},
			],
		},
	],
}

[[containers]]
[[containers.authorized_keys]]
name = "<NAME>"
public_key = "<YOUR_PUBLIC_KEY_HERE>"

To disable SSH, set ssh.enabled to false in your Container configuration:

{
	"containers": [
		{
			"ssh": {
				"enabled": false,
			},
		},
	],
}

[[containers]]
[containers.ssh]
enabled = false

For more information, refer to the SSH documentation.

Cloudflare Gateway now supports natural language policy creation for DNS, HTTP, and Network firewall policies. Administrators can describe the outcome they want in plain language, and Cloudflare will generate a complete policy rule that populates the policy builder form.

To create a policy with natural language, select Create with AI on any Gateway firewall policy tab. Choose a policy type, describe what the policy should do, and a fully configured rule will appear in the policy builder for review. You can edit any field before saving, or re-generate with a different prompt.

The generated policy incorporates your account context - including lists, DLP profiles, applications, and device posture checks - so that references to your existing resources resolve automatically.

A built-in feedback mechanism allows you to rate each generated policy and provide optional comments, which Cloudflare uses to improve output quality over time.

For more information, refer to Gateway firewall policies.

R2 Data Catalog is a managed Apache Iceberg data catalog built directly into your R2 bucket that allows you to connect query engines like R2 SQL, Spark, Snowflake, and DuckDB to your data in R2.

You can now query analytics for your R2 Data Catalog warehouses via Cloudflare's GraphQL Analytics API. Two new datasets are available:

• r2CatalogDataOperationsAdaptiveGroups tracks Iceberg REST API requests made to your catalog, including operation type, request duration, HTTP status, and request body bytes. Use this to monitor request volume and latency across warehouses, namespaces, and tables.
• r2CatalogTableMaintenanceAdaptiveGroups tracks table maintenance jobs such as compaction and snapshot expiration. Use this to monitor job success rates, files processed, bytes read and written, and job duration.

Both datasets support filtering by warehouse name, namespace, table name, and time range. They also include percentile aggregations for duration metrics.

For detailed schema information and example queries, refer to the R2 Data Catalog metrics and analytics documentation.

We’ve added a new Agent Readiness tab to URL Scanner reports accessible via the Cloudflare dashboard. This feature evaluates your site against emerging AI standards and provides six specialized scores to help you optimize for the next generation of AI agents and automated discovery.

The Internet is shifting from a human-read web to a machine-read web. AI agents now browse, interact with, and even perform transactions on websites. If a site isn't "agent-ready," these bots may consume excessive bandwidth, fail to find critical information, or be unable to navigate your services efficiently.

This update provides material value by breaking down readiness into six actionable categories:

• Basic Web Presence
• Discoverability
• Content Accessibility
• Bot Access Control
• Protocol Discovery
• Commerce

You can view these scores for any scanned URL directly in the dashboard or via our API.

• Dashboard: Go to Protect & Connect > Application Security > Investigate. After running a scan, select the Agent Readiness tab in the report.
• API: Use the URL Scanner API ↗ to programmatically retrieve these scores for your infrastructure.

To learn more about the methodology behind these scores, refer to the blogpost ↗.

A new GA release for the Windows Cloudflare One Client is now available on the stable releases downloads page.

This release introduces the new Cloudflare One Client UI for Windows! You can expect a cleaner and more intuitive design as well as easier access to common actions and information. Here are some of the many things we have found our users appreciate:

• Right click context menu to access the most common client actions quickly
• Built-in captive portal login experience

Additional Changes and improvements

• Added a new CLI command: warp-cli mdm refresh. This command executes an immediate refresh of the Mobile Device Management (MDM) configuration file.

Known issues

• Registration authentication for devices via the integrated WebView2 browser is unavailable in this version as a temporary measure. As a result, the client will utilize the default browser on the device to complete the authentication process.
• An error indicating that Microsoft Edge can't read and write to its data directory may be displayed during captive portal login; this error is benign and can be dismissed.
• Registration may hang at "Checking your organization configuration" due to IPC errors. A system reboot should resolve the error, allowing registration to proceed.
• Split tunnel list configuration is not available in the new UI. Management of Split Tunnel entries is currently only possible via warp-cli tunnel ip and warp-cli tunnel host. UI support will be added in a future release.
• Windows ARM may prompt the user to close running applications while trying to install this version. Simply click “Ok” with the default highlighted option.
• DNS resolution may be broken when the following conditions are all true:
  • The client is in Secure Web Gateway without DNS filtering (tunnel-only) mode.
  • A custom DNS server address is configured on the primary network adapter.
  • The custom DNS server address on the primary network adapter is changed while the client is connected.
    To work around this issue, please reconnect the client by selecting "disconnect" and then "connect" in the client user interface.

A new GA release for the macOS Cloudflare One Client is now available on the stable releases downloads page.

This release introduces the new Cloudflare One Client UI for macOS! You can expect a cleaner and more intuitive design as well as easier access to common actions and information. Here are some of the many things we have found our users appreciate:

• Right click context menu to access the most common client actions quickly
• Built-in captive portal login experience

Additional Changes and improvements

• Added a new CLI command: warp-cli mdm refresh. This command executes an immediate refresh of the Mobile Device Management (MDM) configuration file.

Known issues

• Registration may hang at "Checking your organization configuration" due to IPC errors. A system reboot should resolve the error, allowing registration to proceed.
• Split tunnel list configuration is not available in the new UI. Management of split tunnel entries is currently only possible via warp-cli tunnel ip and warp-cli tunnel host. UI support will be added in a future release.

A new GA release for the Linux Cloudflare One Client is now available on the stable releases downloads page.

This release introduces the new Cloudflare One Client UI for Linux! You can expect a cleaner and more intuitive design as well as easier access to common actions and information. Here are some of the many things we have found our users appreciate:

• Right click context menu to access the most common client actions quickly
• Built-in captive portal login experience

Changes and improvements

• Added a new CLI command: warp-cli mdm refresh. This command executes an immediate refresh of the Mobile Device Management (MDM) configuration file.
• Official support for RHEL 9 has been added for Cloudflare Mesh nodes. To install the RHEL 9 package, the Extra Packages for Enterprise Linux (EPEL) repository must be active, as it contains dependencies required for the tray icon and captive portal webview.

Known issues

• Registration may hang at "Checking your organization configuration" due to IPC errors. A system reboot should resolve the error, allowing registration to proceed.
• Split tunnel list configuration is not available in the new UI. Management of split tunnel entries is currently only possible via warp-cli tunnel ip and warp-cli tunnel host. UI support will be added in a future release.

Cloudflare IPsec now supports the standard NAT traversal (NAT-T) flow, where IKE begins on UDP port 500 and switches to UDP port 4500 after NAT is detected.

Previously, devices behind NAT had to be configured to initiate IKE on UDP port 4500 directly. Devices that started on UDP port 500 could not complete the IKE handshake when NAT was in the path. This required custom configuration on devices such as VeloCloud SD-WAN edges, Cisco IOS-XE routers, and Juniper SRX firewalls, and was not possible on every platform.

What changed:

• Devices behind NAT can now initiate IKE on either UDP port 500 or UDP port 4500.
• Devices that start IKE on UDP port 500 and switch to UDP port 4500 after NAT detection now complete the handshake successfully.
• No configuration change is required on Cloudflare. The change is available for all IPsec tunnels on Cloudflare WAN and Magic Transit.

This change does not affect existing tunnels:

• Tunnels using UDP port 500 with no NAT detected continue to operate as before.
• Tunnels configured to start IKE on UDP port 4500 continue to operate as before.
• NAT detection logic is unchanged.

For configuration details, refer to GRE and IPsec tunnels.

Key Findings

• Existing rule enhancements have been deployed to improve detection resilience against broad classes of web attacks and strengthen behavioral coverage.

Continuous Rule Improvements

We are continuously refining our managed rules to provide more resilient protection and deeper insights into attack patterns. To ensure an optimal security posture, we recommend consistently monitoring the Security Events dashboard and adjusting rule actions as these enhancements are deployed.

We are refreshing the Workers AI model catalog to make room for newer releases. Please update your apps to remove references to the models listed below before the deprecation date.

• @cf/zai-org/glm-4.7-flash — fast multilingual model with multi-turn tool calling and coding capabilities.
• @cf/google/gemma-4-26b-a4b-it — efficient open model with vision and tool calling.
• @cf/moonshotai/kimi-k2.6 — capable tool-calling and vision model for agentic workloads and coding.

For pricing, refer to the Workers AI pricing page.

We originally stated Kimi K2.5 would be deprecated on May 10, 2026, however we have extended the deprecation date to May 30, 2026. Requests will be automatically aliased to Kimi K2.6 on May 30, 2026, which has a higher price. Please review the @cf/moonshotai/kimi-k2.6 pricing and model capabilities prior to May 30, 2026 to ensure that the model suits your needs.

• @cf/moonshotai/kimi-k2.5 --> @cf/moonshotai/kimi-k2.6
• @hf/meta-llama/meta-llama-3-8b-instruct
• @cf/meta/llama-3-8b-instruct
• @cf/meta/llama-3-8b-instruct-awq
• @cf/meta/llama-3.1-8b-instruct
• @cf/meta/llama-3.1-8b-instruct-awq
• @cf/meta/llama-3.1-70b-instruct
• @cf/meta/llama-2-7b-chat-int8
• @cf/meta/llama-2-7b-chat-fp16
• @cf/mistral/mistral-7b-instruct-v0.1
• @hf/mistral/mistral-7b-instruct-v0.2
• @hf/google/gemma-7b-it
• @cf/google/gemma-3-12b-it
• @hf/nousresearch/hermes-2-pro-mistral-7b
• @cf/microsoft/phi-2
• @cf/defog/sqlcoder-7b-2
• @cf/unum/uform-gen2-qwen-500m
• @cf/facebook/bart-large-cnn

The -fast and -lora variants of models will remain active, including:

• @cf/meta/llama-3.3-70b-instruct-fp8-fast
• @cf/meta/llama-3.1-8b-instruct-fast
• @cf/google/gemma-7b-it-lora
• @cf/google/gemma-2b-it-lora
• @cf/mistral/mistral-7b-instruct-v0.2-lora
• @cf/meta-llama/llama-2-7b-chat-hf-lora

LoRA models may be deprecated in the future. We will be adding more LoRA capabilities to the catalog, and will communicate when new LoRA models come online to give users time to train new LoRAs before we deprecate old ones.

For the full list of available models, refer to the Workers AI model catalog.

Multiple security vulnerabilities were disclosed by the React team and Vercel affecting React Server Components and Next.js. These include denial of service, middleware and proxy bypass, server-side request forgery, cross-site scripting, and cache poisoning issues across a range of severity levels.

We strongly recommend updating your application and its dependencies immediately. Patched versions are available for React (react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack 19.0.6, 19.1.7, and 19.2.6) and Next.js (15.5.16 and 16.2.5).

Cloudflare WAF rules deployed in response to prior React Server Component CVEs (CVE-2025-55184 ↗ and CVE-2026-23864 ↗) already provide coverage for the newly disclosed denial-of-service vulnerabilities. These rules are enabled by default with a Block action for all customers using the Cloudflare Managed Ruleset, including Free plan customers using the Free Managed Ruleset.

The existing rules detect the underlying attack patterns generically. As a result, they apply to the new CVE-2026-23870 ↗ denial-of-service vulnerability in Server Components and the corresponding Next.js advisory GHSA-8h8q-6873-q5fj ↗.

Cloudflare is investigating whether WAF rules can be safely and effectively deployed for three of the high-severity advisories: CVE-2026-23870 ↗ / GHSA-8h8q-6873-q5fj ↗, GHSA-267c-6grr-h53f ↗, and GHSA-mg66-mrh9-m8jx ↗. If it is possible to create a managed WAF rule that mitigates these CVEs and does not potentially break application behavior, Cloudflare will add additional managed WAF rules. These rules will be announced through the WAF changelog. Because these vulnerabilities were shared with Cloudflare with minimal advance notice, we are still investigating what WAF mitigations are possible.

Several of the disclosed vulnerabilities are not possible to block in WAF. We strongly recommend updating your applications so they are not purely reliant on WAF mitigations.

Customers on Pro, Business, or Enterprise plans should ensure that Managed Rules are enabled.

Vinext: Vinext ↗ is a Vite plugin that reimplements the Next.js API surface. Vinext's latest release is not vulnerable to any of the disclosed CVEs. Vinext's architecture differs from stock Next.js in ways that sidestep the affected code paths. For example, it does not implement the PPR resume protocol, does not expose Pages Router data-route endpoints, and strips internal headers such as x-nextjs-data at request boundaries. As an extra layer of defense, we added a React 19.2.6 or later requirement when running vinext init (PR #1118 ↗, PR #1112 ↗) to prevent accidentally running a vulnerable version of React with Vinext.

OpenNext on Cloudflare: OpenNext is an adapter that lets you deploy Next.js apps to the Cloudflare Workers platform. OpenNext itself is not directly vulnerable to the React denial-of-service CVE, but users must update the Next.js version in their application. The OpenNext team has updated the adapter to further harden against these vectors and released a new version of the Cloudflare adapter. Test fixtures and examples have been updated to use patched versions (PR #1255 ↗).

When the Cloudflare One Appliance is acting as the DHCP server for a LAN, you can now configure custom DHCP options on the leases it issues. This unlocks workflows such as PXE / iPXE boot, VoIP phone provisioning, and vendor-specific client configuration.

Each option is defined by option_number, value, and one of four value types: text, integer, hex, or ip. Configurations are validated on the appliance before being applied — invalid configurations are rejected and the underlying error is returned to the API caller, so a bad option will not disrupt the live DHCP service.

For details, refer to DHCP server options.

Breakout and traffic prioritization rules on the Cloudflare One Appliance can now match by source in addition to destination application. You can pin breakout or priority behavior to:

• A source LAN interface — VLANs attached to that LAN are included automatically.
• A source IP address, range, or CIDR block.

This is the natural way to break out a guest VLAN to the local Internet, or to prioritize traffic from a specific subnet, without enumerating destination applications.

For details, refer to Breakout traffic.

You can now create, rotate, and delete Cloudflare One Virtual Appliance instances and their license keys directly via the API and Terraform.

• Create a virtual appliance and receive a license key: POST /accounts/{account_id}/magic/connectors with device.provision_license: true.
• Rotate the license key for an existing virtual appliance: PATCH /accounts/{account_id}/magic/connectors/{connector_id} with provision_license: true. The previous key is immediately and irrevocably revoked.
• Delete a virtual appliance to release the associated licensed device.

The license key is returned in the response only once, at create or rotate time. Copy and store it securely.

For details, refer to Configure a Cloudflare One Virtual Appliance.

You can now export your Requests for Information (RFI) history to a CSV document and customize your dashboard view by choosing how many RFI records to load per page.

These quality-of-life updates focus on data portability and dashboard performance, allowing power users to manage high volumes of requests more efficiently:

• The new CSV export allows you to move RFI data into external tools for custom reporting, internal auditing, or cross-referencing with other security projects without manual data entry
• With adjustable page density, you can now choose to load more records at once (10, 25 or 50) to scan through history faster

Cloudforce One subscribers can find these new options in Cloudflare Dashboard > Application Security > Threat Intelligence > Requests for Information ↗.

You can now interact with your Stream video library using new bindings for Workers! This allows customers to upload content to Stream, provision direct uploads, manage videos, and generate signed URLs from a Worker without making authenticated API calls. We're excited to bring Stream and Workers closer together to empower more programmatic pipelines, tighter integrations, and support generative AI and inference workloads.

Use the Stream binding when you want to:

• Upload videos from URLs or create basic direct upload links for end users
• Generate signed playback tokens without managing signing keys
• Manage video metadata, captions, downloads, and watermarks
• Build video pipelines entirely within Workers

To get started, add the Stream binding to your Wrangler configuration:

{
  "$schema": "./node_modules/wrangler/config-schema.json",
  "stream": {
    "binding": "STREAM"
  }
}

[stream]
binding = "STREAM"

Generate a video with AI and upload directly to Stream or send a URL of a file you already have:

const aiResponse = await env.AI.run(
	"google/veo-3.1",
	{
		prompt: "A dog walking next to a river",
		duration: "10s",
		aspect_ratio: "16:9",
		resolution: "1080p",
		generate_audio: true,
	},
	{
		gateway: { id: "experiments" },
	},
);

// Veo will return a URL of the generated asset.
const videoUrl = aiResponse.result.video;

// Alternative option: a video of the Austin Office mobile
// const videoUrl = 'https://pub-d9fcbc1abcd244c1821f38b99017347f.r2.dev/aus-mobile.mp4';

// Upload to Stream by providing a URL
const streamVideo = await env.STREAM.upload(videoUrl);

// The streamVideo response will include the video ID, playback and manifest
// URLs, and other information, just like the REST API.

const aiResponse = await env.AI.run(
	'google/veo-3.1',
	{
		prompt: 'A dog walking next to a river',
		duration: '10s',
		aspect_ratio: '16:9',
		resolution: '1080p',
		generate_audio: true,
	},
	{
		gateway: { id: 'experiments' },
	},
);

// Veo will return a URL of the generated asset.
const videoUrl = aiResponse.result.video;

// Alternative option: a video of the Austin Office mobile
// const videoUrl = 'https://pub-d9fcbc1abcd244c1821f38b99017347f.r2.dev/aus-mobile.mp4';

// Upload to Stream by providing a URL
const streamVideo = await env.STREAM.upload(videoUrl);

// The streamVideo response will include the video ID, playback and manifest
// URLs, and other information, just like the REST API.

Generate a signed URL without using a signing key or an API call:

const video_id = "ce800be43a9772f4bb02f35b860fb516";
const token = await env.STREAM.video(video_id).generateToken();

// Use the "token" in an iframe embed code, manifest URL, or thumbnail:
const embedUrl = `https://customer-igynxd2rwhmuoxw8.cloudflarestream.com/${token}/iframe`;

const video_id = 'ce800be43a9772f4bb02f35b860fb516';
const token = await env.STREAM.video(video_id).generateToken();

// Use the "token" in an iframe embed code, manifest URL, or thumbnail:
const embedUrl = `https://customer-igynxd2rwhmuoxw8.cloudflarestream.com/${token}/iframe`;

Get and set video properties easily:

const video_id = "46c8b7f480d410840758c1cb14a72e47";
const result = await env.STREAM.video(video_id).details();

await env.STREAM.video(video_id).update({
	meta: { name: "sample video" },
});

const video_id = '46c8b7f480d410840758c1cb14a72e47';
const result = await env.STREAM.video(video_id).details();

await env.STREAM.video(video_id).update({
  meta: { name: 'sample video' }
});

For setup instructions and the full API reference, refer to Bind to Workers API.

Add a binding for Cloudflare Stream (env.STREAM). On the watch page, use the Stream binding to get info based on the ID, and leverage video.meta.name as the page title.

This emergency release introduces a new rule to detect Next.js App Router middleware and proxy bypass attempts via segment-prefetch routes (CVE-2026-44575).

Key Findings

CVE-2026-44575: Next.js Middleware / Proxy Bypass in App Router Applications via Segment-Prefetch Routes

Successful exploitation allows unauthenticated attackers to bypass middleware or proxy-based authorization checks in affected Next.js App Router applications. This leads to unauthorized access to protected content, potential exposure of sensitive application data, and compromise of application security boundaries.

We strongly recommend upgrading to Next.js 15.5.16 or 16.2.5 (or later) immediately to address the underlying vulnerability. If you cannot upgrade immediately, enforce authorization in the underlying route or page logic instead of relying solely on middleware.

You can now get a single unified trace across Worker-to-Worker subrequests, with trace context propagating automatically. Previously, automatic tracing produced disconnected traces when a Worker called another Worker through a service binding or Durable Object.

This means you can:

• Follow a request through your entire Worker architecture in one trace view
• See service binding and Durable Object calls as nested child spans instead of separate traces
• Debug cross-Worker request flows in the Cloudflare dashboard or in an external observability platform via OpenTelemetry

Tracing must be enabled in your Wrangler configuration for traces to be recorded. Checkout Workers tracing to get started.

Up next, we are working on external trace context propagation using W3C Trace Context standards ↗, which will allow traces from your Workers to link with traces from services outside of Cloudflare.