---
id: "GHSA-9473-5f9j-94wq"
kind: "vulnerability"
aliases: ["GHSA-9473-5f9j-94wq"]
title: "WAF Release - 2026-07-29 \u00b7 Changelog"
severity: "critical"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["cloudflare", "lab-disclosure", "nuxt", "runtime", "self-hosted"]
not_affected_if: ["no-server-islands"]
published_at: "2026-07-29T18:42:17+00:00"
first_seen_at: "2026-10-24T18:43:45+00:00"
updated_at: "2026-10-25T05:30:39+00:00"
sources: [{"source": "lab", "url": "https://developers.cloudflare.com/changelog/post/2026-07-29-waf-release/", "first_seen_at": "2026-10-24T18:43:45+00:00"}]
---

# WAF Release - 2026-07-29 · Changelog

Nuxt Server Islands accept component names and props from remote requests without authentication. An attacker can use those parameters to run code on the server.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check whether the application uses Nuxt Server Islands (`<NuxtIsland>` or server island components).
- Check the installed Nuxt version with `npm ls nuxt` and compare it with the fixed version listed in the advisory (unknown in the sources).

## Fix

- Upgrade Nuxt to the patched version listed in GHSA-9473-5f9j-94wq (version unknown in the sources).
- If you use Cloudflare, confirm that the Managed Ruleset rule "Nuxt Server Island - RCE" (ID ...8ec012ea) is set to Block; this is a WAF mitigation, not a code fix.

## Timeline

- 2026-10-24T18:43:45+00:00 lab https://developers.cloudflare.com/changelog/post/2026-07-29-waf-release/ — Cloudflare: WAF Release - 2026-07-29 · Changelog

## Documents

- [advisory] Cloudflare: WAF Release - 2026-07-29 · Changelog https://developers.cloudflare.com/changelog/post/2026-07-29-waf-release/

## From the sources

WAF Release - 2026-07-29 · Changelog

# Changelog

New updates and improvements at Cloudflare.

July 29, 2026

## 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.

| Ruleset | Rule ID | Legacy Rule ID | Description | Previous Action | New Action | Comments |
| --- | --- | --- | --- | --- | --- | --- |
| Cloudflare Managed Ruleset | ...c2e84e2d | N/A | SSRF - Cloud - Beta | Log | Block | This is an improved detection. |
| Cloudflare Managed Ruleset | ...761e7a4c | N/A | Command Injection - Obfuscation | Log | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...7347c892 | N/A | Alibaba Fastjson JSONType Remote Code Execution - Body | Log | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...8ec012ea | N/A | Nuxt Server Island - RCE | N/A | Block | This is a new detection.This was labeled as Generic Rules - RCE. |
| Cloudflare Managed Ruleset | ...3590a4ad | N/A | Generic Rules - RCE | N/A | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...9c6dff1c | N/A | Generic Rules - XSS | N/A | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...3a5b40d6 | N/A | File Upload - RCE | N/A | Block | This is a new detection. |
| Cloudflare Free Ruleset | ...cfe1a93c | N/A | Generic Rules - RCE | N/A | Block | This is a new detection. |
| Cloudflare Free Ruleset | ...9ab5ed95 | N/A | Generic Rules - XSS | N/A | Block | This is a new detection. |
| Cloudflare Free Ruleset | ...1b7f9c67 | N/A | File Upload - RCE | N/A | Block | This is a new detection. |

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_