Security Advisory

CVE-2025-5991

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2025-06-11 07:33:41

Last updated 2026-07-29 08:33:06

Assigner TQtC

CVSS score 2.1

State PUBLISHED

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.

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