CVE-2025-6338 – Possible denial of service with multiple incoming connections to a Schannel based server with a TLS backend

CVE ID : CVE-2025-6338

Published : Oct. 16, 2025, 10:15 a.m. | 25 minutes ago

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.

Severity: 9.2 | CRITICAL

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