CVE-2025-30221
📋 TL;DR
Pitchfork versions before 0.11.0 are vulnerable to HTTP Response Header Injection when used with Rack 3. This allows attackers to inject malicious headers into HTTP responses, potentially leading to client-side attacks like cross-site scripting or cache poisoning. Only applications using Pitchfork with Rack 3 are affected.
💻 Affected Systems
- Pitchfork
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could inject malicious headers to perform client-side attacks like XSS, session hijacking, or cache poisoning against users accessing the vulnerable server.
Likely Case
Limited header injection leading to cache poisoning or minor client-side manipulation, depending on application configuration and attacker access.
If Mitigated
With proper input validation and output encoding in the Rack application layer, impact would be minimal even if Pitchfork is vulnerable.
🎯 Exploit Status
Exploitation requires understanding of HTTP header injection techniques and access to send requests to the vulnerable server.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.11.0
Vendor Advisory: https://github.com/Shopify/pitchfork/security/advisories/GHSA-pfqj-w6r6-g86v
Restart Required: Yes
Instructions:
1. Update Pitchfork gem to version 0.11.0 or later. 2. Update Gemfile to specify 'gem "pitchfork", ">= 0.11.0"'. 3. Run 'bundle update pitchfork'. 4. Restart the Pitchfork server process.
🔧 Temporary Workarounds
Downgrade to Rack 2
allUse Rack 2.x instead of Rack 3 with Pitchfork, as the vulnerability only exists with Rack 3.
gem uninstall rack -v '>= 3.0'
gem install rack -v '~> 2.0'
Update Gemfile to specify 'gem "rack", "~> 2.0"'
bundle update rack
🧯 If You Can't Patch
- Implement a reverse proxy or WAF with HTTP header validation to filter malicious headers
- Monitor application logs for unusual header patterns or injection attempts
🔍 How to Verify
Check if Vulnerable:
Check Pitchfork version and Rack version. If Pitchfork < 0.11.0 AND Rack >= 3.0, the system is vulnerable.Check Version:
bundle exec pitchfork --version && bundle exec ruby -e "require 'rack'; puts Rack::VERSION"Verify Fix Applied:
Verify Pitchfork version is 0.11.0 or higher and confirm the application functions normally after update.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP headers in response logs
- Malformed header patterns containing newlines or special characters
Network Indicators:
- HTTP responses with unexpected or duplicate headers
- Headers containing injection patterns like CRLF sequences
SIEM Query:
http.response.headers:*\r\n* OR http.response.headers:*%0d%0a*