CVE catalog

CVE-2025-6338

qt6-base: CVE-2025-6338

Severity: Critical · CVSS 9.2CVSS: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
Published: Jun 29, 2025, 10:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.43% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	qt6-base	sid	`6.11.2+dfsg-7`	not affected
Debian	qt6-base	forky	`6.11.2+dfsg-5`	not affected
Debian	qt6-base	trixie	`6.8.2+dfsg-9+deb13u2`	not affected
Debian	qt6-base	bookworm	`6.4.2+dfsg-10`	not affected

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	qt6-base	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	qt6-base	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	qt6-base	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	qt6-base	source	bookworm	`Not affected`	unimportant	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libqt6concurrent6]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6core6]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6dbus6]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6gui6]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6network6]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6opengl6]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6opengl6-dev]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6openglwidgets6]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6printsupport6]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6sql6]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6sql6-ibase]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6sql6-mysql]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6sql6-odbc]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6sql6-psql]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6sql6-sqlite]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6test6]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6widgets6]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[libqt6xml6]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[qmake6]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
[qmake6-bin]Not affected
Source package: [qt6-base]
Details (2)
- 6.4.2+dfsg-10 · amd64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm
- 6.4.2+dfsg-10 · arm64 · bookworm
  Not affected
  dsa · qt6-base · debian · bookworm

Next results

Observed: Oct 24, 2026, 9:36:53 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)]