---
id: CVE-2025-6338
title: >-
  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.
summary: >-
  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: none
cwe:
  - CWE-459
published: '2025-10-16'
updated: '2026-07-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-6338'
references:
  - url: 'https://codereview.qt-project.org/c/qt/qtbase/+/651495'
    label: a59d8014-47c4-4630-ab43-e1b13cbe58e3
tags:
  - nvd
epss: 0.00427
epssPercentile: 0.3421
ingestedAt: '2026-07-29T10:45:50.456Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.