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

Severity: low (CVSS 2.1 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-23 · updated 2026-10-23
Weakness: CWE-416

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.

Affected products

Qt: from 6.9.0 before 6.11.3 — fixed in 6.11.3

How to fix

Upgrade to a fixed version: Qt 6.11.3. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2026-95620 or the next vulnerability affects your stack