---
title: WAF Release - 2025-12-11 - Emergency
description: Cloudflare WAF managed rulesets 2025-12-11 emergency release
image: https://developers.cloudflare.com/changelog-preview.png
---

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## WAF Release - 2025-12-11 - Emergency

Dec 11, 2025 

[ WAF ](https://developers.cloudflare.com/waf/) 

This emergency release introduces rules for CVE-2025-55183 and CVE-2025-55184, targeting server-side function exposure and resource-exhaustion patterns, respectively.

**Key Findings**

Added coverage for Leaking Server Functions (CVE-2025-55183) and React Function DoS detection (CVE-2025-55184).

**Impact**

These updates strengthen protection for server-function abuse techniques (CVE-2025-55183, CVE-2025-55184) that may expose internal logic or disrupt application availability.

| Ruleset                    | Rule ID     | Legacy Rule ID | Description                                           | Previous Action | New Action | Comments                                                            |
| -------------------------- | ----------- | -------------- | ----------------------------------------------------- | --------------- | ---------- | ------------------------------------------------------------------- |
| Cloudflare Managed Ruleset | ...fefb4e9b | N/A            | React - Leaking Server Functions - CVE:CVE-2025-55183 | N/A             | Block      | This was labeled as Generic - Server Function Source Code Exposure. |
| Cloudflare Free Ruleset    | ...251e86aa | N/A            | React - Leaking Server Functions - CVE:CVE-2025-55183 | N/A             | Block      | This was labeled as Generic - Server Function Source Code Exposure. |
| Cloudflare Managed Ruleset | ...102ec699 | N/A            | React - DoS - CVE:CVE-2025-55184                      | N/A             | Disabled   | This was labeled as Generic – Server Function Resource Exhaustion.  |

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