---
description: Cloudflare WAF managed rulesets 2026-08-26 emergency release
title: WAF Release - 2026-08-26 - Emergency
image: https://developers.cloudflare.com/changelog/post/2026-08-26-emergency-waf-release/og.png?v=7a8fdc1bcea1dc12
---

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August 26, 2026

## WAF Release - 2026-08-26 - Emergency

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

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/changelog/post/2026-08-26-emergency-waf-release/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

This emergency release updates an existing Next.js remote code execution rule to identify CVE-2026-75604 and adds a new rule for remote code execution in the Next.js Image Optimizer via crafted AVIF images.

**Key Findings**

- CVE-2026-75604 affects Windows-hosted Next.js applications using both the Pages Router and App Router without Cache Components and can lead to unauthenticated remote code execution.
- GHSA-2xp9-vwfh-vxw4 affects the Next.js Image Optimizer and can lead to unauthenticated remote code execution when it optimizes an attacker-controlled AVIF image.

**Impact**

Next.js recommends updating to version 16.3.3 or 15.5.24 to address these vulnerabilities.

| Ruleset | Rule ID | Legacy Rule ID | Description | Previous Action | New Action | Comments |
| --- | --- | --- | --- | --- | --- | --- |
| Cloudflare Managed Ruleset | ...2ca6cce3 | N/A | Next.js - Remote Code Execution - CVE:CVE-2026-75604 | Block | N/A | Rule metadata description refined. Detection unchanged. |
| Cloudflare Managed Ruleset | ...80256efe | N/A | Next.js - Image Optimizer Remote Code Execution via Crafted AVIF | N/A | Block | This is a new detection. |

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