A memory handling flaw (CVE-2025-9900, CVSS 8.8) in the LibTIFF library bundled with QT WebEngine can be triggered by parsing a malformed TIFF image, potentially leading to denial of service, information disclosure, or arbitrary code execution. The vulnerability affects multiple Ubuntu LTS releases from 18.04 through 26.04. A fix is available via Ubuntu Pro's ESM Apps channel, with specific patched package versions listed in the USN.
Ubuntu Security Notices USN-8347-1 USN-8347-1: QT WebEngine vulnerability Publication date 28 May 2026 Overview QT WebEngine could be made to crash or run programs if it received specially crafted input. Releases 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Related notices Packages qtwebengine-opensource-src - QT application web browser engine Details It was discovered that the vendored LibTIFF in QT WebEngine incorrectly handled memory when parsing malformed TIFF image metadata. An attacker could possibly use this issue to cause a denial of service, obtain sensitive information, or execute arbitrary code. It was discovered that the vendored LibTIFF in QT WebEngine incorrectly handled memory when parsing malformed TIFF image metadata. An attacker could possibly use this issue to cause a denial of service, obtain sensitive information, or execute arbitrary code. Update instructions In general, a standard system update will make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 26.04 LTS resolute libqt5webengine-data – 5.15.19+dfsg2-4ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webengine5 – 5.15.19+dfsg2-4ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webenginecore5 – 5.15.19+dfsg2-4ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webenginewidgets5 – 5.15.19+dfsg2-4ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qml-module-qtwebengine – 5.15.19+dfsg2-4ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qtwebengine5-dev – 5.15.19+dfsg2-4ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qtwebengine5-dev-tools – 5.15.19+dfsg2-4ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. 24.04 LTS noble libqt5pdf5 – 5.15.16+dfsg-3ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5pdfwidgets5 – 5.15.16+dfsg-3ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webengine-data – 5.15.16+dfsg-3ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webengine5 – 5.15.16+dfsg-3ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webenginecore5 – 5.15.16+dfsg-3ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webenginewidgets5 – 5.15.16+dfsg-3ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qml-module-qtquick-pdf – 5.15.16+dfsg-3ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qml-module-qtwebengine – 5.15.16+dfsg-3ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qt5-image-formats-plugin-pdf – 5.15.16+dfsg-3ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qtpdf5-dev – 5.15.16+dfsg-3ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qtwebengine5-dev – 5.15.16+dfsg-3ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qtwebengine5-dev-tools – 5.15.16+dfsg-3ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qtwebengine5-private-dev – 5.15.16+dfsg-3ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. 22.04 LTS jammy libqt5pdf5 – 5.15.9+dfsg-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5pdfwidgets5 – 5.15.9+dfsg-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webengine-data – 5.15.9+dfsg-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webengine5 – 5.15.9+dfsg-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webenginecore5 – 5.15.9+dfsg-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webenginewidgets5 – 5.15.9+dfsg-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qml-module-qtquick-pdf – 5.15.9+dfsg-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qml-module-qtwebengine – 5.15.9+dfsg-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qt5-image-formats-plugin-pdf – 5.15.9+dfsg-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qtpdf5-dev – 5.15.9+dfsg-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qtwebengine5-dev – 5.15.9+dfsg-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qtwebengine5-dev-tools – 5.15.9+dfsg-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. 20.04 LTS focal libqt5webengine-data – 5.12.8+dfsg-0ubuntu1.1+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webengine5 – 5.12.8+dfsg-0ubuntu1.1+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webenginecore5 – 5.12.8+dfsg-0ubuntu1.1+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webenginewidgets5 – 5.12.8+dfsg-0ubuntu1.1+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qml-module-qtwebengine – 5.12.8+dfsg-0ubuntu1.1+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qtwebengine5-dev – 5.12.8+dfsg-0ubuntu1.1+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qtwebengine5-dev-tools – 5.12.8+dfsg-0ubuntu1.1+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. 18.04 LTS bionic libqt5webengine-data – 5.9.5+dfsg-0ubuntu2+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webengine5 – 5.9.5+dfsg-0ubuntu2+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webenginecore5 – 5.9.5+dfsg-0ubuntu2+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libqt5webenginewidgets5 – 5.9.5+dfsg-0ubuntu2+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qml-module-qtwebengine – 5.9.5+dfsg-0ubuntu2+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qtwebengine5-dev – 5.9.5+dfsg-0ubuntu2+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. qtwebengine5-dev-tools – 5.9.5+dfsg-0ubuntu2+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2025-9900 CVE-2025-9900 Related notices USN-8346-1 USN-8345-1 USN-7783-1 USN-8346-1 USN-8345-1 USN-7783-1