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.

Reserved 2025-06-11 | Published 2025-06-11 | Updated 2025-06-11 | Assigner TQtC

Problem types

CWE-416 Use After Free

Product status

Default status
unaffected

Any version before 6.9.0
unaffected

6.9.0
affected

6.9.1
unaffected

References

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

cve.org (CVE-2025-5991)

nvd.nist.gov (CVE-2025-5991)

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