Description
There is an incomplete cleanup vulnerability in Qt Network's Schannel support on Windows which can lead to a Denial of Service over a long period. This issue affects Qt from 5.15.0 through 6.8.3, from 6.9.0 before 6.9.2.
References (1)
Core 1
Core References
Various Sources
https://codereview.qt-project.org/c/qt/qtbase/+/651495
Scores
CVSS v4
9.2
EPSS
0.0040
EPSS Percentile
32.3%
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-459
Status
published
Products (8)
Qt/Qt
< 5.15.0
Qt/Qt
5.15.0 - 6.8.3
Qt/Qt
6.8.4 - 6.9.0
Qt/Qt
6.9.0 - 6.9.2
The Qt Company/Qt
< 5.15.0
The Qt Company/Qt
5.15.0 - 6.8.3
The Qt Company/Qt
6.8.4 - 6.9.0
The Qt Company/Qt
6.9.0 - 6.9.2
Published
Oct 16, 2025
Tracked Since
Feb 18, 2026