CVE-2026-1761
📋 TL;DR
A stack-based buffer overflow vulnerability in libsoup allows remote attackers to execute arbitrary code or crash applications by sending specially crafted multipart HTTP responses. This affects any application using vulnerable libsoup versions to process untrusted server responses. No authentication or user interaction is required for exploitation.
💻 Affected Systems
- libsoup
- applications using libsoup for HTTP processing
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the affected application, potentially leading to full system compromise.
Likely Case
Application crashes (denial of service) and potential memory corruption leading to information disclosure.
If Mitigated
Limited impact if network filtering blocks malicious multipart responses or applications don't process untrusted content.
🎯 Exploit Status
Exploitation requires crafting malicious multipart HTTP responses but doesn't require authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisories for specific patched versions
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2026-1761
Restart Required: Yes
Instructions:
1. Check your distribution's security advisories. 2. Update libsoup package using your package manager. 3. Restart affected applications/services.
🔧 Temporary Workarounds
Network filtering
allBlock or filter multipart HTTP responses from untrusted sources at network perimeter
Application configuration
allConfigure applications to avoid processing multipart responses from untrusted servers
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems
- Use web application firewalls to filter malicious multipart responses
🔍 How to Verify
Check if Vulnerable:
Check libsoup version and compare against patched versions in vendor advisoriesCheck Version:
rpm -q libsoup (RHEL) or dpkg -l | grep libsoup (Debian/Ubuntu)Verify Fix Applied:
Verify libsoup package version matches patched version from vendor📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Memory corruption errors in application logs
Network Indicators:
- Unusual multipart HTTP responses with malformed boundaries
- HTTP responses triggering buffer overflow patterns
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "buffer overflow") AND process="*libsoup*"