CVE-2026-1801
📋 TL;DR
This HTTP Request Smuggling vulnerability in libsoup allows attackers to send specially crafted chunked requests that get misinterpreted as multiple HTTP requests. This can lead to information disclosure by bypassing security controls. Any application using vulnerable versions of libsoup for HTTP communication is affected.
💻 Affected Systems
- libsoup
- applications using libsoup for HTTP communication
⚠️ 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
Complete information disclosure including sensitive data, authentication bypass, or cache poisoning attacks against downstream systems.
Likely Case
Information leakage through request smuggling that bypasses security filters or access controls.
If Mitigated
Limited impact with proper network segmentation, WAF filtering, and monitoring in place.
🎯 Exploit Status
Exploitation requires crafting specific malformed chunk headers but doesn't require authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific version
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2026-1801
Restart Required: Yes
Instructions:
1. Check vendor advisory for patched version. 2. Update libsoup package using system package manager. 3. Restart affected services using libsoup.
🔧 Temporary Workarounds
WAF Configuration
allConfigure Web Application Firewall to reject malformed chunk headers
Disable Chunked Encoding
allConfigure applications to disable chunked transfer encoding if possible
🧯 If You Can't Patch
- Implement strict HTTP request validation at reverse proxy or load balancer layer
- Segment network to limit exposure of vulnerable systems
🔍 How to Verify
Check if Vulnerable:
Check libsoup version against vendor advisory. For Red Hat: rpm -q libsoupCheck Version:
rpm -q libsoup (Red Hat) or dpkg -l libsoup* (Debian/Ubuntu)Verify Fix Applied:
Verify libsoup version matches patched version from vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP parsing errors
- Multiple requests from single source with malformed chunk headers
Network Indicators:
- HTTP requests with LF instead of CRLF in chunk headers
- Abnormal request smuggling patterns
SIEM Query:
http.request.method AND (http.chunked_encoding OR http.transfer_encoding) AND anomaly_detected