CVE-2026-2443
📋 TL;DR
A memory disclosure vulnerability in libsoup's HTTP Range header processing allows remote attackers to read portions of server memory beyond intended responses. This affects GNOME-based systems and applications using the vulnerable SoupServer component. Exploitation requires specific vulnerable configurations and access to the server.
💻 Affected Systems
- libsoup
- GNOME applications using libsoup
- Red Hat Enterprise Linux
- Fedora
- Ubuntu with GNOME
⚠️ 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
Remote attacker reads sensitive data from server memory, potentially exposing credentials, session tokens, or other confidential information.
Likely Case
Limited memory disclosure of non-sensitive data due to configuration requirements and memory layout constraints.
If Mitigated
No impact if proper input validation and memory protections are in place.
🎯 Exploit Status
Exploitation requires crafting malicious HTTP Range headers and targeting servers with vulnerable configurations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: libsoup 3.4.4 or later
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2026-2443
Restart Required: Yes
Instructions:
1. Update libsoup package using system package manager. 2. Restart affected services using libsoup. 3. Verify version is 3.4.4 or higher.
🔧 Temporary Workarounds
Disable HTTP Range support
linuxConfigure applications to reject HTTP Range headers if not required.
# Application-specific configuration required
Network filtering
allBlock or sanitize HTTP Range headers at network perimeter.
# Use WAF or proxy to filter malicious headers
🧯 If You Can't Patch
- Implement strict input validation for HTTP headers in application layer
- Deploy network controls to monitor and block suspicious HTTP Range requests
🔍 How to Verify
Check if Vulnerable:
Check libsoup version and verify if using SoupServer with vulnerable configuration.Check Version:
pkg-config --modversion libsoup-3.0Verify Fix Applied:
Confirm libsoup version is 3.4.4 or higher and services have been restarted.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP Range header patterns
- Multiple failed range requests
- Server error logs related to memory access
Network Indicators:
- HTTP requests with crafted Range headers
- Unusual response sizes from range requests
SIEM Query:
http.request.header:"Range" AND (http.status_code:500 OR http.response.length > expected)