A null pointer dereference vulnerability in the Qt QNetworkAccessManager class of the Qt Network module has been discovered and has been assigned the CVE id CVE-2026-96432.
Affected versions: from 6.8.0 to 6.8.9, from 6.9.0 to 6.11.2
Impact: Availability — a malicious or compromised server can trigger the condition, causing the affected application to crash.
CVSS 4.0 Score: 2.1 / Low
Vector String: CVSS:4.0/AV:N/AC:L/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
Mitigation: Disable HTTP/2 using QNetworkRequest::setAttribute(QNetworkRequest::Http2AllowedAttribute, false).
Solution: Apply the following patch or update to Qt 6.8.10, Qt 6.11.3 or later.
Patches:
Qt 6.11: https://codereview.qt-project.org/c/qt/qtbase/+/768246 or https://download.qt.io/official_releases/qt/6.11/CVE-2026-96432-qtbase-6.11.diff
Qt 6.8: https://codereview.qt-project.org/c/qt/tqtc-qtbase/+/774283 or https://download.qt.io/archive/qt/6.8/CVE-2026-96432-qtbase-6.8.diff
