UBUNTU-CVE-2025-5991

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...

CVE-2025-5991

CVE-2025-5991 affects Qt 6.9.0 and is fixed in Qt 6.9.1. The vulnerability is a Use After Free in QtNetwork’s QHttp2ProtocolHandler, caused by a race between QHttp2Stream’s POST body upload and simultaneous handling of HTTP error responses. It only impacts HTTP/2 handling (not HTTP). Exploitation...