PT-2025-25184 · Qt Company+1 · Qt+1

Published 2025-06-11 · Updated 2025-06-11 · CVE-2025-5991

Positive Technologies (AI Summary)

CVSS v4.0

2.1

Low

Base vector

AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L

Name of the Vulnerable Software and Affected Versions Qt versions 6.9.0

Description The issue is a "Use After Free" vulnerability in Qt's QHttp2ProtocolHandler in the QtNetwork module, affecting only HTTP/2 handling. This occurs due to a race condition between uploading the body of a POST request and handling HTTP error responses simultaneously.

Recommendations For Qt version 6.9.0, update to Qt 6.9.1 to resolve the issue. As a temporary workaround, consider disabling HTTP/2 handling in the QtNetwork module until the update is applied.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2025-5991

ECHO-E7F4-9860-3083

Affected Products

Debian

Qt

References · 11

• https://nvd.nist.gov/vuln/detail/CVE-2025-5991 · Security Note
• https://cve.org/CVERecord?id=CVE-2025-5991 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-5991 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-5991 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-5991 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-5991 · Vendor Advisory
• https://codereview.qt-project.org/c/qt/qtbase/+/643777 · Note
• https://twitter.com/CVEnew/status/1932706960333250773 · Twitter Post
• https://t.me/cvetracker/26008 · Telegram Post
• https://t.me/cvenotify/125362 · Telegram Post
• https://twitter.com/VulmonFeeds/status/1932753469087100988 · Twitter Post