Cloudflare Release Notes

The Workers runtime now automatically sends a reciprocal Close frame when it receives a Close frame from the peer. The readyState transitions to CLOSED before the close event fires. This matches the WebSocket specification ↗︎ and standard browser behavior.

This change is enabled by default for Workers using compatibility dates on or after 2026-04-07 (via the web_socket_auto_reply_to_close compatibility flag). Existing code that manually calls close() inside the close event handler will continue to work — the call is silently ignored when the WebSocket is already closed.

const [client, server] = Object.values(new WebSocketPair());
server.accept();

server.addEventListener("close", (event) => {
	// readyState is already CLOSED — no need to call server.close().
	console.log(server.readyState); // WebSocket.CLOSED
	console.log(event.code); // 1000
	console.log(event.wasClean); // true
});

Half-open mode for WebSocket proxying

The automatic close behavior can interfere with WebSocket proxying, where a Worker sits between a client and a backend and needs to coordinate the close on both sides independently. To support this use case, pass { allowHalfOpen: true } to accept():

You can now manage mutual TLS (mTLS) and Bring Your Own Certificate Authority (BYO CA) configurations directly from the Cloudflare dashboard — no API required.

Previously, these advanced workflows required the Cloudflare API. The following are now available in the dashboard:

• AOP certificate management — Upload and manage your own certificate authorities for Authenticated Origin Pulls (AOP) directly from the dashboard.
• BYO Client mTLS certificate management — Upload and manage your own CA certificates for client mTLS enforcement without needing API access.
• CDN hostname to client mTLS certificate mapping — Associate client mTLS certificates with specific hostnames directly from the dashboard.

This week's release introduces new detections for a critical Remote Code Execution (RCE) vulnerability in MCP Server (CVE-2026-23744), alongside targeted protection for an authentication bypass vulnerability in SolarWinds products (CVE-2025-40552). Additionally, this release includes a new generic detection rule designed to identify and block Cross-Site Scripting (XSS) injection attempts leveraging "OnEvent" handlers within HTTP cookies.

Key Findings

• MCP Server (CVE-2026-23744): A vulnerability in the Model Context Protocol (MCP) server implementation where malformed input payloads can trigger a memory corruption state, allowing for arbitrary code execution.

• SolarWinds (CVE-2025-40552): A critical flaw in the authentication module allows unauthenticated attackers to bypass security filters and gain unauthorized access to the management console due to improper identity token validation.

• XSS OnEvents Cookies: This generic rule identifies malicious event handlers (such as onload or onerror) embedded within HTTP cookie values.

Impact

Successful exploitation of the MCP Server and SolarWinds vulnerabilities could allow unauthenticated attackers to execute arbitrary code or gain administrative control, leading to a full system takeover. Additionally, the new generic XSS detection prevents attackers from leveraging browser event handlers in cookies to hijack user sessions or execute malicious scripts.

Ruleset

Rule ID

Legacy Rule ID …

Redesigned "Get Help" Portal for faster, personalized help

Cloudflare has officially launched a redesigned "Get Help" Support Portal to eliminate friction and get you to a resolution faster. Previously, navigating support meant clicking through multiple tiles, categorizing your own technical issues across 50+ conditional fields, and translating your problem into Cloudflare's internal taxonomy.

The new experience replaces that complexity with a personalized front door built around your specific account plan. Whether you are under a DDoS attack or have a simple billing question, the portal now presents a single, clean page that surfaces the direct paths available to you — such as "Ask AI", "Chat with a human", or "Community" — without the manual triage.

What's New

• One Page, Clear Choices: No more navigating a grid of overlapping categories. The portal now uses action cards tailored to your plan (Free, Pro, Business, or Enterprise), ensuring you only see the support channels you can actually use.
• A Radically Simpler Support Form: We've reduced the ticket submission process from four+ screens and 50+ fields to a single screen with five critical inputs. You describe the issue in your own words, and our backend handles the categorization. …

Cloudflare Email Security now supports DANE (DNS-based Authentication of Named Entities) for MX deployments. This enhancement strengthens email transport security by enabling DNSSEC-backed certificate verification for our regional MX records.

• Regional MX hostnames now publish DANE TLSA records backed by DNSSEC, enabling DANE-capable SMTP senders to cryptographically validate certificate identities before establishing TLS connections—moving beyond opportunistic encryption to verified encrypted delivery.
• DANE support is automatically available for all customers using regional MX deployments. No additional configuration is required; DANE-capable mail infrastructure will automatically validate MX certificates using the published records.

This applies to all Email Security packages:

• Advantage
• Enterprise
• Enterprise + PhishGuard

We're announcing the public beta of Organizations for enterprise customers, a new top-level Cloudflare container that lets Cloudflare customers manage multiple accounts, members, analytics, and shared policies from one centralized location.

What's New

Organizations [BETA]: Organizations are a new top-level container for centrally managing multiple accounts. Each Organization supports up to 500 accounts and 5000 zones, giving larger teams a single place to administer resources at scale.

Self-serve onboarding: Enterprise customers can create an Organization in the dashboard and assign accounts where they are already Super Administrators.

Centralized Account Management: At launch, every Organization member has the Organization Super Admin role. Organization Super Admins can invite other users and manage any child account under the Organization implicitly. Shared policies: Share WAF or Gateway policies across multiple accounts within your Organization to simplify centralized policy management. Implicit access: Members of an Organization automatically receive Super Administrator permissions across child accounts, removing the need for explicit membership on each…

We're announcing the public beta of Organizations for enterprise customers, a new top-level Cloudflare container that lets Cloudflare customers manage multiple accounts, members, analytics, and shared policies from one centralized location.

What's New

Organizations [BETA]: Organizations are a new top-level container for centrally managing multiple accounts. Each Organization supports up to 500 accounts and 5000 zones, giving larger teams a single place to administer resources at scale.

Self-serve onboarding: Enterprise customers can create an Organization in the dashboard and assign accounts where they are already Super Administrators.

Centralized Account Management: At launch, every Organization member has the Organization Super Admin role. Organization Super Admins can invite other users and manage any child account under the Organization implicitly. Shared policies: Share WAF or Gateway policies across multiple accounts within your Organization to simplify centralized policy management. Implicit access: Members of an Organization automatically receive Super Administrator permissions across child accounts, removing the need for explicit membership on each…

You can now specify placement constraints to control where your Containers run.

Constraint

Values

Use case

regions

ENAM, WNAM, EEUR, WEUR

Geographic placement

jurisdiction

eu, fedramp

Compliance boundaries

Use regions to limit placement to specific geographic areas. Use jurisdiction to restrict containers to compliance boundaries — eu maps to European regions (EEUR, WEUR) and fedramp maps to North American regions (ENAM, WNAM).

Refer to Containers placement for more details.

We are partnering with Google to bring @cf/google/gemma-4-26b-a4b-it to Workers AI. Gemma 4 26B A4B is a Mixture-of-Experts (MoE) model built from Gemini 3 research, with 26B total parameters and only 4B active per forward pass. By activating a small subset of parameters during inference, the model runs almost as fast as a 4B-parameter model while delivering the quality of a much larger one.

Gemma 4 is Google's most capable family of open models, designed to maximize intelligence-per-parameter.

Key capabilities

• Mixture-of-Experts architecture with 8 active experts out of 128 total (plus 1 shared expert), delivering frontier-level performance at a fraction of the compute cost of dense models
• 256,000 token context window for retaining full conversation history, tool definitions, and long documents across extended sessions
• Built-in thinking mode that lets the model reason step-by-step before answering, improving accuracy on complex tasks
• Vision understanding for object detection, document and PDF parsing, screen and UI understanding, chart comprehension, OCR (including multilingual), and handwriting recognition, with support for variable aspect ratios and resolutions
• Function calling with native support for structured tool use, enabling agentic workflows and multi-step planning …

AI Gateway now supports automatic retries at the gateway level. When an upstream provider returns an error, your gateway retries the request based on the retry policy you configure, without requiring any client-side changes.

You can configure the retry count (up to 5 attempts), the delay between retries (from 100ms to 5 seconds), and the backoff strategy (Constant, Linear, or Exponential). These defaults apply to all requests through the gateway, and per-request headers can override them.

Retry Requests settings in the AI Gateway dashboard

This is particularly useful when you do not control the client making the request and cannot implement retry logic on the caller side. For more complex failover scenarios — such as failing across different providers — use Dynamic Routing.

For more information, refer to Manage gateways.

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

This release contains minor fixes and improvements.

The next stable release for macOS will introduce the new Cloudflare One Client UI, providing a cleaner and more intuitive design as well as easier access to common actions and information.

Changes and improvements

• Empty MDM files are now rejected instead of being incorrectly accepted as a single MDM config.
• Fixed an issue in local proxy mode where the client could become unresponsive due to upstream connection timeouts.
• Fixed an issue where the emergency disconnect status of a prior organization persisted after a switch to a different organization.
• Consumer-only CLI commands are now clearly distinguished from Zero Trust commands.
• Added detailed QUIC connection metrics to diagnostic logs for better troubleshooting.
• Added monitoring for tunnel statistics collection timeouts.
• Switched tunnel congestion control algorithm for local proxy mode to Cubic for improved reliability across platforms.
• Fixed initiating managed network detections checks when no network is available, which caused device profile flapping.

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

This release contains minor fixes and improvements.

The next stable release for Linux will introduce the new Cloudflare One Client UI, providing a cleaner and more intuitive design as well as easier access to common actions and information.

Changes and improvements

• Empty MDM files are now rejected instead of being incorrectly accepted as a single MDM config.
• Fixed an issue in local proxy mode where the client could become unresponsive due to upstream connection timeouts.
• Fixed an issue where the emergency disconnect status of a prior organization persisted after a switch to a different organization.
• Consumer-only CLI commands are now clearly distinguished from Zero Trust commands.
• Added detailed QUIC connection metrics to diagnostic logs for better troubleshooting.
• Added monitoring for tunnel statistics collection timeouts.
• Switched tunnel congestion control algorithm for local proxy mode to Cubic for improved reliability across platforms.
• Fixed initiating managed network detections checks when no network is available, which caused device profile flapping.

MCP server portals support in-session management of upstream MCP server connections. Users can return to the server selection page at any time to enable or disable servers, reauthenticate, or change which data a server has access to — all without leaving their MCP client.

To return to the server selection page, ask your AI agent with a prompt like "take me back to the server selection page." The portal responds with an authorization URL via MCP elicitation ↗︎ that you open in your browser:

https://<subdomain>.<domain>/authorize?elicitationId=<ELICITATION_ID>

From the server selection page you can:

• Enable or disable servers — Toggle individual upstream MCP servers on or off. Disabling a server removes its tools from the active session, which reduces context window usage.
• Log out and reauthenticate — Log out of a server and log back in to change which data the server has access to, or to reauthenticate with different permissions.

Users can also enable or disable a server inline by asking their AI agent directly, for example "enable the wiki server" or "disable my Jira server." …

AI Gateway now supports automatic retries at the gateway level. When an upstream provider returns an error, your gateway retries the request based on the retry policy you configure, without requiring any client-side changes.

You can configure the retry count (up to 5 attempts), the delay between retries (from 100ms to 5 seconds), and the backoff strategy (Constant, Linear, or Exponential). These defaults apply to all requests through the gateway, and per-request headers can override them.

Retry Requests settings in the AI Gateway dashboard

This is particularly useful when you do not control the client making the request and cannot implement retry logic on the caller side. For more complex failover scenarios — such as failing across different providers — use Dynamic Routing.

For more information, refer to Manage gateways.

Cloudflare Logpush now supports BigQuery as a native destination.

Logs from Cloudflare can be sent to Google Cloud BigQuery ↗︎ via Logpush. The destination can be configured through the Logpush UI in the Cloudflare dashboard or by using the Logpush API.

For more information, refer to the Destination Configuration documentation.

Access authentication logs and Gateway activity logs (DNS, Network, and HTTP) now feature a refreshed user interface that gives you more flexibility when viewing and analyzing your logs.

Screenshot of the new logs UI showing DNS query logs with customizable columns and filtering options

The updated UI includes:

• Filter by field - Select any field value to add it as a filter and narrow down your results.
• Customizable fields - Choose which fields to display in the log table. Querying for fewer fields improves log loading performance.
• View details - Select a timestamp to view the full details of a log entry.
• Switch to classic view - Return to the previous log viewer interface if needed.

For more information, refer to Access authentication logs and Gateway activity logs.

All wrangler workflows commands now accept a --local flag to target a Workflow running in a local wrangler dev session instead of the production API.

You can now manage the full Workflow lifecycle locally, including triggering Workflows, listing instances, pausing, resuming, restarting, terminating, and sending events:

npx wrangler workflows list --local
npx wrangler workflows trigger my-workflow --local
npx wrangler workflows instances list my-workflow --local
npx wrangler workflows instances pause my-workflow <INSTANCE_ID> --local
npx wrangler workflows instances send-event my-workflow <INSTANCE_ID> --type my-event --local

All commands also accept --port to target a specific wrangler dev session (defaults to 8787).

For more information, refer to Workflows local development.

AI Search supports a wrangler ai-search command namespace. Use it to manage instances from the command line.

The following commands are available:

Command

Description

wrangler ai-search create

Create a new instance with an interactive wizard

wrangler ai-search list

List all instances in your account

wrangler ai-search get

Get details of a specific instance

wrangler ai-search update

Update the configuration of an instance

wrangler ai-search delete

Delete an instance

wrangler ai-search search

Run a search query against an instance

wrangler ai-search stats

Get usage statistics for an instance

The create command guides you through setup, choosing a name, source type (r2 or web), and data source. You can also pass all options as flags for non-interactive use:

wrangler ai-search create my-instance --type r2 --source my-bucket

Use wrangler ai-search search to query an instance directly from the CLI:

wrangler ai-search search my-instance --query "how do I configure caching?"

All commands support --json for structured output that scripts and AI agents can parse directly.

For full usage details, refer to the Wrangler commands documentation.