CVE-2025-5991 LOW

CVE-2025-5991: Use after free in QHttp2ProtocolHandler

Vendor The Qt Company
Product Qt
Weakness CWE-416
Published June 11, 2025
Last update June 11, 2025
View on NVD All CVEs

CVSS base score

2.1/10
Attack vector Local
Attack complexity High
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 11, 2025 CVE published
June 11, 2025 Record updated