---
description: Cloudflare WAF managed rulesets 2025-12-03 emergency release
title: WAF Release - 2025-12-03 - Emergency
image: https://developers.cloudflare.com/changelog/post/2025-12-03-emergency-waf-release/og.png?v=67e107004303bbeb
---

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December 3, 2025

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

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

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/changelog/post/2025-12-03-emergency-waf-release/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

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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