WAF Release - 2026-08-26 - Emergency
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 | N/A | Next.js - Remote Code Execution - CVE:CVE-2026-75604 | Block | N/A | Rule metadata description refined. Detection unchanged. | |
| Cloudflare Managed Ruleset | N/A | Next.js - Image Optimizer Remote Code Execution via Crafted AVIF | N/A | Block | This is a new detection. |