QTextCodec TSCII encoding of the Qt 5 Compatibility APIs module (Qt Core in Qt 5 and earlier) has been discovered and has been assigned the CVE id CVE-2026-107472.
Affected versions: from Qt 4.0.0 to Qt 6.8.8, from Qt 6.9.0 to Qt 6.11.2
Impact: Applications that convert text to the TSCII encoding through QTextCodec may read memory outside the input buffer, which can cause the application to crash or misinterpret the data.
CVSS 4.0 Score: 4.3 / Medium
Vector String: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/R:U/RE:L/U:Green
Mitigation: None
Solution: Apply the following patch or update to Qt 6.8.9, Qt 6.11.3, Qt 6.12.0 or later.
Patches:
dev: https://codereview.qt-project.org/c/qt/qt5compat/+/762021
Qt 6.11: https://codereview.qt-project.org/c/qt/qt5compat/+/766195 or https://download.qt.io/official_releases/qt/6.11/CVE-2026-107472-qt5compat-6.11.diff
Qt 6.8: https://codereview.qt-project.org/c/qt/tqtc-qt5compat/+/766289 or https://download.qt.io/archive/qt/6.8/CVE-2026-107472-qt5compat-6.8.diff
