Security Advisory: Qt Network

Qt Network incorrectly parses the strict-transport-security (HSTS) header, allowing unencrypted connections to be established, even when explicitly prohibited by the server. This happens if the case used for this header does not matching directly. Unencrypted connections are susceptible to man-in-the-middle attacks. Those connections could be established by using URLs with the http instead of the https scheme. With HSTS, the https scheme must be used regardless.

Solution: Apply the following patch or update to Qt 5.15.14, Qt 6.2.9 or Qt 6.5.1

Patches:

dev: <https://codereview.qt-project.org/c/qt/qtbase/+/477560&gt;
Qt 6.5: <https://codereview.qt-project.org/c/qt/qtbase/+/476494&gt; or <https://download.qt.io/official_releases/qt/6.5/CVE-2023-32762-qtbase-6.5.diff&gt;
Qt 6.2: <https://download.qt.io/official_releases/qt/6.2/CVE-2023-32762-qtbase-6.2.diff&gt;
Qt 5.15: <https://download.qt.io/official_releases/qt/5.15/CVE-2023-32762-qtbase-5.15.diff&gt;