CVE-2025-32908
📋 TL;DR
A vulnerability in libsoup's HTTP/2 server allows improper validation of pseudo-header values, potentially enabling denial of service attacks. This affects systems using libsoup for HTTP/2 communication, particularly web servers and applications relying on this library for network operations.
💻 Affected Systems
- libsoup
- applications using libsoup HTTP/2 server 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
Complete service unavailability through resource exhaustion or crash of the HTTP/2 server component, disrupting all HTTP/2 traffic.
Likely Case
Partial service degradation or intermittent availability issues affecting HTTP/2 connections specifically.
If Mitigated
Minimal impact with proper input validation and resource limits in place at higher layers.
🎯 Exploit Status
Exploitation requires sending specially crafted HTTP/2 requests with invalid pseudo-header values.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Red Hat advisory RHSA-2025:7505 for specific patched versions
Vendor Advisory: https://access.redhat.com/errata/RHSA-2025:7505
Restart Required: Yes
Instructions:
1. Update libsoup package using system package manager. 2. Restart affected services using libsoup. 3. Verify the update with version check.
🔧 Temporary Workarounds
Disable HTTP/2
linuxConfigure libsoup or applications to use only HTTP/1.x, bypassing the vulnerable HTTP/2 component.
Set environment variable or configuration: SOUP_DISABLE_HTTP2=1
🧯 If You Can't Patch
- Implement network filtering to block or rate-limit HTTP/2 traffic to vulnerable systems.
- Use reverse proxies or WAFs with HTTP/2 validation rules to sanitize requests before reaching libsoup.
🔍 How to Verify
Check if Vulnerable:
Check libsoup version against Red Hat advisory; if using HTTP/2 and unpatched version, assume vulnerable.Check Version:
rpm -q libsoup (Red Hat/Fedora) or dpkg -l libsoup* (Debian/Ubuntu)Verify Fix Applied:
Confirm libsoup package version matches patched version from vendor advisory and test HTTP/2 functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP/2 connection resets
- Server errors related to header parsing
- Increased error rates in HTTP/2 logs
Network Indicators:
- Malformed HTTP/2 frames with pseudo-headers
- Abnormal HTTP/2 session termination patterns
SIEM Query:
Search for HTTP/2 protocol anomalies or libsoup process crashes in system logs.