CVE-2026-1467
📋 TL;DR
This CRLF injection vulnerability in libsoup allows attackers to inject malicious HTTP headers or request bodies when an HTTP proxy is configured. It affects applications using vulnerable libsoup versions with proxy support enabled. Attackers can manipulate proxy behavior to send unauthorized requests to downstream services.
💻 Affected Systems
- libsoup
- applications using libsoup for HTTP client functionality
⚠️ 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 complete HTTP requests through the proxy, potentially accessing internal services, performing SSRF attacks, or manipulating proxy cache behavior.
Likely Case
Header injection allowing manipulation of proxy behavior, potentially enabling request smuggling or cache poisoning attacks.
If Mitigated
Limited impact with proper input validation and proxy configuration restrictions in place.
🎯 Exploit Status
Exploitation requires attacker to control URL input that gets URL-decoded and used in Host header construction with proxy enabled.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor-specific updates (e.g., Red Hat, Ubuntu, Debian security advisories)
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2026-1467
Restart Required: Yes
Instructions:
1. Check your distribution's security advisories. 2. Update libsoup package using system package manager. 3. Restart affected applications/services using libsoup.
🔧 Temporary Workarounds
Disable HTTP proxy support
allConfigure applications to not use HTTP proxy functionality in libsoup if not required.
Application-specific configuration; set proxy settings to 'none' or direct connection
Input validation for URLs
allImplement strict validation and sanitization of URL inputs before passing to libsoup.
Application code changes required; validate URLs don't contain CRLF sequences
🧯 If You Can't Patch
- Implement WAF rules to block requests containing CRLF sequences in URLs
- Use network segmentation to isolate proxy servers from sensitive internal services
🔍 How to Verify
Check if Vulnerable:
Check libsoup version and verify if HTTP proxy functionality is enabled in applications.Check Version:
pkg-config --modversion libsoup-2.4 (or appropriate version) or check package managerVerify Fix Applied:
Verify updated libsoup version and test proxy functionality with CRLF sequences to ensure they're properly rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests with CRLF sequences in URLs
- Proxy logs showing malformed Host headers
Network Indicators:
- HTTP requests containing %0D%0A or other CRLF encodings in URL parameters
SIEM Query:
http.url CONTAINS "%0D%0A" OR http.url CONTAINS "\r\n"