CVE-2025-5991 — Use after free in QHttp2ProtocolHandler
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.…
Published: 2025-06-11 · CVSS: 2.1 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7