CVE-2025-5991 — Use After Free in QT Company QT

CWE-416 — Use After FreeCWE-125 — Out-of-bounds Read7 documents6 sources
Severity
2.1LOWNVD
EPSS
0.1%
top 75.61%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
10
THE QT Company QTDebian Qt6-baseDebian Qtbase-opensource-src+7 more
Timeline
PublishedJun 11

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.

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

Affected Packages10 packages

▶CVEListV5the_qt_company/qt6.9.0

🔴Vulnerability Details

3
GHSA
GHSA-xv5c-vg59-hj7x: There is a "Use After Free" vulnerability in Qt's QHttp2ProtocolHandler in the QtNetwork module↗2025-06-11
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OSV
CVE-2025-5991: There is a "Use After Free" vulnerability in Qt's QHttp2ProtocolHandler in the QtNetwork module↗2025-06-11
▶
OSV
CVE-2025-5991: There is a "Use After Free" vulnerability in Qt's QHttp2ProtocolHandler in the QtNetwork module↗2025-06-11
▶

📋Vendor Advisories

3
Red Hat
qt: Use after free in Qt↗2025-06-11
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Debian
CVE-2025-5991: qt6-base - There is a "Use After Free" vulnerability in Qt's QHttp2ProtocolHandler in the Q...↗2025
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Microsoft
Buffer overread in domain name matching↗2024-08-13
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CVE-2025-5991 — Use After Free in THE QT Company QT | cvebase