Low severityNVD Advisory· Published Jun 11, 2025· Updated Apr 15, 2026
CVE-2025-5991
CVE-2025-5991
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.
Affected products
5- Range: = 6.9.0
- osv-coords3 versionspkg:deb/debian/qt6-base?arch=sourcepkg:deb/debian/qtbase-opensource-src?arch=sourcepkg:deb/debian/qtbase-opensource-src-gles?arch=source
>= 0+ 2 more
- (no CPE)range: >= 0
- (no CPE)range: >= 0
- (no CPE)range: >= 0
Patches
Vulnerability mechanics
References
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