What is CVE-2025-6338?

CVE-2025-6338 is a vulnerability in Qt, classified under Incomplete Cleanup. Published 2025-10-16.

Is CVE-2025-6338 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Qt

CVE-2025-6338

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.

EPSS: 0.004 (35.2th percentile) — read the EPSS interpretation.

Affected products

Qt — versions 0, 5.15.0, 6.8.4
The Qt Company — versions 0, 5.15.0, 6.8.4

Weakness classification (CWE)

CWE-459 — Incomplete Cleanup

Public proof-of-concept exploits

imaiguo/qteverywhere.6.9.1

References

a59d8014-47c4-4630-ab43-e1b13cbe58e3

Frequently asked questions

What is CVE-2025-6338?: CVE-2025-6338 is a vulnerability in Qt, classified under Incomplete Cleanup. Published 2025-10-16.
Is CVE-2025-6338 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.