What’s Vulnerable › Vulnerabilities
CVE-2025-5991: Use after free in QHttp2ProtocolHandler
- Severity: low (CVSS 2.1 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-06-11 · updated 2026-07-29
- Weakness: CWE-416
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.
Affected products
- Qt: 6.9.0
References
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