[Announce] Security advisory: zlib in Qt

[List for announcements regarding Qt releases and development]

Hi,

zlib through 1.2.12 has a heap-based buffer over-read or buffer overflow in inflate in inflate.c via a large gzip header extra field and has been assigned the CVE id CVE-2022-37434. 

As this only affects applications that call inflateGetHeader directly then applications using Qt are not directly affected by this at all. The symbol may still be exploited if used in conjunction with another vulnerability or if the application uses this function directly.

Solution: Apply the following patches (two from Gerrit, or single downloadable patch) or update to Qt 6.4.0, Qt 6.3.2, Qt 6.2.6 or Qt 5.15.11

Patches:
dev: https://codereview.qt-project.org/c/qt/qtbase/+/429597 and https://codereview.qt-project.org/c/qt/qtbase/+/430422
Qt 6.4: https://codereview.qt-project.org/c/qt/qtbase/+/429655 and https://codereview.qt-project.org/c/qt/qtbase/+/430870
Qt 6.3: https://codereview.qt-project.org/c/qt/qtbase/+/429654 and https://codereview.qt-project.org/c/qt/qtbase/+/430919 or https://download.qt.io/official_releases/qt/6.3/CVE-2022-37434-qtbase-6.3.patch
Qt 6.2: https://codereview.qt-project.org/c/qt/tqtc-qtbase/+/429679 and https://codereview.qt-project.org/c/qt%2Ftqtc-qtbase/+/430921 or https://download.qt.io/official_releases/qt/6.2/CVE-2022-37434-qtbase-6.2.patch
Qt 5.15: https://codereview.qt-project.org/c/qt%2Ftqtc-qtbase/+/429680 and https://codereview.qt-project.org/c/qt%2Ftqtc-qtbase/+/430922 or https://download.qt.io/official_releases/qt/5.15/CVE-2022-37434-qtbase-5.15.patch

Kind regards,
Andy
--
Andy Shaw
Director, Technical Customer Success 
The Qt Company