---
title: WAF Release - 2025-12-03 - Emergency
description: Cloudflare WAF managed rulesets 2025-12-03 emergency release
image: https://developers.cloudflare.com/changelog-preview.png
---

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## WAF Release - 2025-12-03 - Emergency

Dec 03, 2025 

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

The WAF rule deployed yesterday to block unsafe deserialization-based RCE has been updated. The rule description now reads “React – RCE – CVE-2025-55182”, explicitly mapping to the recently disclosed React Server Components vulnerability. Detection logic remains unchanged.

**Key Findings**

Rule description updated to reference React – RCE – CVE-2025-55182 while retaining existing unsafe-deserialization detection.

**Impact**

Improved classification and traceability with no change to coverage against remote code execution attempts.

| Ruleset                    | Rule ID     | Legacy Rule ID | Description                      | Previous Action | New Action | Comments                                                |
| -------------------------- | ----------- | -------------- | -------------------------------- | --------------- | ---------- | ------------------------------------------------------- |
| Cloudflare Managed Ruleset | ...5fb92fba | N/A            | React - RCE - CVE:CVE-2025-55182 | N/A             | Block      | Rule metadata description changed. Detection unchanged. |
| Cloudflare Free Ruleset    | ...99702280 | N/A            | React - RCE - CVE:CVE-2025-55182 | N/A             | Block      | Rule metadata description changed. Detection unchanged. |

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