WAF - WAF Release - 2026-07-29

This release introduces new rules and updates existing threat signatures to provide targeted protections for vulnerabilities in Nuxt Server Island components and Alibaba Fastjson deserialization routines, alongside enhanced protections for cloud metadata Server-Side Request Forgery (SSRF) and obfuscated command injection attempts.

Key Findings

• Nuxt Server Island - RCE(GHSA-9473-5f9j-94wq): An unauthenticated vulnerability in Nuxt Server Islands where remote attackers can supply arbitrary component names or props to endpoints. Manipulating these parameters allows unauthenticated component Remote Code Execution (RCE) on the server.

• Alibaba Fastjson JSONType Remote Code Execution: A unauthenticated remote code execution vulnerability in Alibaba Fastjson (≤ 1.2.83) during JSON deserialization. Under default configurations, attackers can execute arbitrary system commands, bypassing traditional classpath and gadget-based defenses.

• Generic Protections (SSRF & Command Injection): Added improved detection logic targeting Server-Side Request Forgery (SSRF) in cloud-hosted applications, alongside new rules targeting obfuscated command injection patterns across request parameters.

RulesetRule IDLegacy Rule IDDescriptionPrevious ActionNew ActionCommentsCloudflare Managed Ruleset...c2e84e2dN/ASSRF - Cloud - BetaLogBlock

This is an improved detection.

Cloudflare Managed Ruleset...761e7a4cN/ACommand Injection - ObfuscationLogBlock

This is a new detection.

Cloudflare Managed Ruleset...7347c892N/AAlibaba Fastjson JSONType Remote Code Execution - BodyLogBlock

This is a new detection.

Cloudflare Managed Ruleset...8ec012eaN/ANuxt Server Island - RCEN/ABlock

This is a new detection.This was labeled as Generic Rules - RCE.

Cloudflare Managed Ruleset...3590a4adN/AGeneric Rules - RCEN/ABlock

This is a new detection.

Cloudflare Managed Ruleset...9c6dff1cN/AGeneric Rules - XSSN/ABlock

This is a new detection.

Cloudflare Managed Ruleset...3a5b40d6N/AFile Upload - RCEN/ABlock

This is a new detection.

Cloudflare Free Ruleset...cfe1a93cN/AGeneric Rules - RCEN/ABlock

This is a new detection.

Cloudflare Free Ruleset...9ab5ed95N/AGeneric Rules - XSSN/ABlock

This is a new detection.

Cloudflare Free Ruleset...1b7f9c67N/AFile Upload - RCEN/ABlock

This is a new detection.