---
description: Cloudflare WAF managed rulesets 2026-01-26 release
title: WAF Release - 2026-01-26
image: https://developers.cloudflare.com/changelog/post/2026-01-26-waf-release/og.png?v=cbd57a2809465348
---

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January 26, 2026

## WAF Release - 2026-01-26

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

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/changelog/post/2026-01-26-waf-release/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

This week’s release introduces new detections for denial-of-service attempts targeting React CVE-2026-23864 ([https://www.cve.org/CVERecord?id=CVE-2026-23864 ↗︎](https://www.cve.org/CVERecord?id=CVE-2026-23864)).

**Key Findings**

- CVE-2026-23864 ([https://www.cve.org/CVERecord?id=CVE-2026-23864 ↗︎](https://www.cve.org/CVERecord?id=CVE-2026-23864)) affects `react-server-dom-parcel`, `react-server-dom-turbopack`, and `react-server-dom-webpack` packages.
- Attackers can send crafted HTTP requests to Server Function endpoints, causing server crashes, out-of-memory exceptions, or excessive CPU usage.

| Ruleset | Rule ID | Legacy Rule ID | Description | Previous Action | New Action | Comments |
| --- | --- | --- | --- | --- | --- | --- |
| Cloudflare Managed Ruleset | ...61680354 | N/A | React Server - DOS - CVE:CVE-2026-23864 - 1 | N/A | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...dcdffcf8 | N/A | React Server - DOS - CVE:CVE-2026-23864 - 2 | N/A | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...349edbc6 | N/A | React Server - DOS - CVE:CVE-2026-23864 - 3 | N/A | Block | This is a new detection. |

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