CVE-2025-5991

Use after free in QHttp2ProtocolHandler

CVSS 2.1 LOWEPSS 0.1%CWE-416

Vexday Risk Score

8Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 2.1EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

11 Jun 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L

Affected products

The Qt Company · Qt

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References

https://codereview.qt-project.org/c/qt/qtbase/+/643777