CVE-2025-5991
No fix known EPSS <1%CVSS 2.1
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.
Products: qt
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 11 | qtbase-opensource-src | no fix |
| Debian 11 | qtbase-opensource-src-gles | no fix |
| Debian 12 | qt6-base | no fix |
| Debian 12 | qtbase-opensource-src | no fix |
| Debian 12 | qtbase-opensource-src-gles | no fix |
| Debian 13 | qt6-base | no fix |
| Debian 13 | qtbase-opensource-src | no fix |
| Debian 13 | qtbase-opensource-src-gles | no fix |
| Ubuntu 16.04 LTS | qtbase-opensource-src-gles | no fix |
| Ubuntu 20.04 LTS | qtbase-opensource-src-gles | no fix |
| Ubuntu 22.04 LTS | qt6-base | no fix |
| Ubuntu 22.04 LTS | qtbase-opensource-src-gles | no fix |
| Ubuntu 24.04 LTS | qt6-base | no fix |
| Ubuntu 24.04 LTS | qtbase-opensource-src-gles | no fix |
| Ubuntu 25.10 | qt6-base | no fix |
| Ubuntu 25.10 | qtbase-opensource-src-gles | no fix |
| Ubuntu 26.04 LTS | qt6-base | no fix |
| Ubuntu 26.04 LTS | qtbase-opensource-src-gles | no fix |
| Ubuntu 26.10 | qt6-base | no fix |
| Ubuntu 26.10 | qtbase-opensource-src-gles | no fix |