| Name | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| qt6-base (PTS) | bookworm | 6.4.2+dfsg-10 | vulnerable |
| trixie, sid | 6.8.2+dfsg-6 | vulnerable |
| qtbase-opensource-src (PTS) | bullseye | 5.15.2+dfsg-9+deb11u1 | vulnerable |
| bookworm | 5.15.8+dfsg-11+deb12u3 | vulnerable |
| trixie, sid | 5.15.15+dfsg-5 | vulnerable |
| qtbase-opensource-src-gles (PTS) | bullseye | 5.15.2+dfsg-4 | vulnerable |
| bookworm | 5.15.8+dfsg-3 | vulnerable |
| trixie, sid | 5.15.15+dfsg-2 | vulnerable |
The information below is based on the following data on fixed versions.
Notes
[bookworm] - qt6-base <no-dsa> (Minor issue)
[bookworm] - qtbase-opensource-src <no-dsa> (Minor issue)
https://codereview.qt-project.org/c/qt/qtbase/+/643777
The -gles package doesn't build the HTTP2 code, only included in the source package