Vulnerability Description
There is a "Use After Free" vulnerability in Qt's QHttp2ProtocolHandler in the QtNetwork module. This only affects HTTP/2 handling, HTTP handling is not affected by this at all. This happens due to a race condition between how QHttp2Stream uploads the body of a POST request and the simultaneous handling of HTTP error responses. This issue only affects Qt 6.9.0 and has been fixed for Qt 6.9.1.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2025-5991?
CVE-2025-5991 is a documented vulnerability. There is a "Use After Free" vulnerability in Qt's QHttp2ProtocolHandler in the QtNetwork module. This only affects HTTP/2 handling, HTTP handling is not affected by this at all. This happens due to a ...
How severe is CVE-2025-5991?
CVSS scoring is not yet available for CVE-2025-5991. Check NVD for updates.
Is there a patch for CVE-2025-5991?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.