VULNERABILITY INTELLIGENCE
CVE-2025-5991
EPSS probability0.14%
CISA KEVNot currently listed
Published2025-06-11
Last modified2026-07-29
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.
Weakness classification
- a59d8014-47c4-4630-ab43-e1b13cbe58e3: CWE-416