Uncontrolled resource consumption vulnerability in the Qt Framework HTTP response handling functionality of the Qt Network module has been discovered and has been assigned the CVE id CVE-2026-116337.
Affected versions: from Qt 4.5.0 to Qt 6.8.10 or Qt 6.12.1
Affected status unknown before Qt 4.5.0
Impact: Availability. An application using the affected functionality can run out of memory when it connects to a malicious or compromised server, causing a denial of service.
CVSS 4.0 Score: 0.6 (Low)
Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:U/R:U/RE:L/U:Green
Mitigation: None available.
Solution: Apply the following patch or update to Qt 6.8.10, Qt 6.12.1 or later. Qt source code tarballs are available at https://download.qt.io/archive/qt/
Patches:
dev: https://codereview.qt-project.org/c/qt/qtbase/+/774266 or https://codereview.qt-project.org/c/qt/qtbase/+/774223
6.12: https://codereview.qt-project.org/c/qt/qtbase/+/777902 https://codereview.qt-project.org/c/qt/qtbase/+/777191 or https://download.qt.io/archive/qt/6.12/CVE-2026-116337-qtbase-6.12-0001.diff https://download.qt.io/archive/qt/6.12/CVE-2026-116337-qtbase-6.12-0002.diff
6.11: https://codereview.qt-project.org/c/qt%2Fqtbase/+/783685 https://codereview.qt-project.org/c/qt%2Fqtbase/+/783686 or https://download.qt.io/official_releases/qt/6.11/CVE-2026-116337-qtbase-6.11-0001.diff https://download.qt.io/official_releases/qt/6.11/CVE-2026-116337-qtbase-6.11-0002.diff
6.8: https://codereview.qt-project.org/c/qt/tqtc-qtbase/+/777994 https://codereview.qt-project.org/c/qt/tqtc-qtbase/+/777331 or https://download.qt.io/archive/qt/6.8/CVE-2026-116337-qtbase-6.8-0001.diff https://download.qt.io/archive/qt/6.8/CVE-2026-116337-qtbase-6.8-0002.diff
