CVE-2026-22809
📋 TL;DR
A Regular Expression Denial of Service (ReDoS) vulnerability in tarteaucitron.js allows attackers to cause denial of service by sending specially crafted issuu_id parameters. This affects websites using tarteaucitron.js cookie banner versions before 1.29.0, potentially making them unresponsive.
💻 Affected Systems
- tarteaucitron.js
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service making the website unresponsive to legitimate users, requiring server restart to recover.
Likely Case
Degraded performance and intermittent service disruptions affecting user experience.
If Mitigated
Minimal impact with proper input validation and rate limiting in place.
🎯 Exploit Status
ReDoS attacks typically require minimal technical skill to execute.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.29.0
Vendor Advisory: https://github.com/AmauriC/tarteaucitron.js/security/advisories/GHSA-q5f6-qxm2-mcqm
Restart Required: No
Instructions:
1. Update tarteaucitron.js to version 1.29.0 or later
2. Replace the existing tarteaucitron.js file with the patched version
3. Clear browser caches if necessary
🔧 Temporary Workarounds
Input Validation
allImplement server-side validation for issuu_id parameter before passing to tarteaucitron.js
Rate Limiting
allImplement rate limiting on endpoints that accept issuu_id parameter
🧯 If You Can't Patch
- Disable or remove issuu_id parameter functionality if not required
- Implement Web Application Firewall (WAF) rules to block suspicious issuu_id patterns
🔍 How to Verify
Check if Vulnerable:
Check if tarteaucitron.js version is below 1.29.0 in your website source codeCheck Version:
Check the tarteaucitron.js file header or version variable in the JavaScript fileVerify Fix Applied:
Verify tarteaucitron.js version is 1.29.0 or higher in your website source code📡 Detection & Monitoring
Log Indicators:
- Unusually high CPU usage on web server
- Multiple failed requests with similar issuu_id patterns
- Increased response times for cookie banner functionality
Network Indicators:
- Multiple requests with malformed issuu_id parameters
- Requests with extremely long issuu_id values
SIEM Query:
source="web_server" AND (cpu_usage>90 OR response_time>5000ms) AND uri="*issuu_id*"