CVE-2025-5991
EPSS 0.08%
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.
How to fix CVE-2025-5991
No fixed version has been published yet. Mitigate by removing the affected package or applying upstream guidance from the references below.
- Debian/qt6-base—no fix listed
- —no fix listed
- —no fix listed
Is CVE-2025-5991 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0
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