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.
History

Thu, 12 Jun 2025 15:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.6, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L'}

threat_severity

Moderate


Wed, 11 Jun 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 11 Jun 2025 07:45:00 +0000

Type Values Removed Values Added
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.
Title Use after free in QHttp2ProtocolHandler
Weaknesses CWE-416
References
Metrics cvssV4_0

{'score': 2.1, 'vector': 'CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: TQtC

Published: 2025-06-11T07:33:41.071Z

Updated: 2025-06-11T13:18:09.662Z

Reserved: 2025-06-11T06:08:23.434Z

Link: CVE-2025-5991

cve-icon Vulnrichment

Updated: 2025-06-11T13:18:05.881Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-06-11T08:15:22.933

Modified: 2025-06-12T16:06:20.180

Link: CVE-2025-5991

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-06-11T07:33:41Z

Links: CVE-2025-5991 - Bugzilla