{"id":"UBUNTU-CVE-2026-9499","details":"An out-of-bounds read (buffer over-read) vulnerability exists in QTextCodec::codecForName() in Qt. When the function is called with a QByteArray that is not NUL-terminated (for example, one created with QByteArray::fromRawData()), the codec-name matching routine reads past the end of the supplied buffer. In most cases this results in an incorrect text codec being selected; in the worst case, if the over-read reaches unmapped memory, the process crashes (denial of service). The over-read is bounded by the length of the longest codec-name candidate, and the out-of-bounds bytes are only compared internally against Qt's fixed list of codec names, so no data is disclosed to an attacker. Applications that do not pass non-NUL-terminated QByteArrays to QTextCodec::codecForName() are not exposed. The affected code resides in the Qt5Compat module from Qt 6.0.0 onward, and in Qt Core (qtbase) in Qt 4.x and Qt 5.x.","modified":"2026-07-29T10:19:00.696801677Z","published":"2026-07-21T14:16:00Z","upstream":["CVE-2026-9499"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-9499"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-9499"},{"type":"REPORT","url":"https://codereview.qt-project.org/c/qt/qt5compat/+/723911"},{"type":"REPORT","url":"https://codereview.qt-project.org/c/qt/qt5compat/+/724348"},{"type":"REPORT","url":"https://codereview.qt-project.org/c/qt/qt5compat/+/724995"}],"affected":[{"package":{"name":"qtbase-opensource-src","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/qtbase-opensource-src?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.4.2+dfsg-2ubuntu9","5.5.1+dfsg-6ubuntu4","5.5.1+dfsg-10ubuntu2","5.5.1+dfsg-13ubuntu1","5.5.1+dfsg-13ubuntu2","5.5.1+dfsg-13ubuntu3","5.5.1+dfsg-14ubuntu1","5.5.1+dfsg-14ubuntu2","5.5.1+dfsg-14ubuntu3","5.5.1+dfsg-15ubuntu1","5.5.1+dfsg-16ubuntu1","5.5.1+dfsg-16ubuntu6","5.5.1+dfsg-16ubuntu7","5.5.1+dfsg-16ubuntu7.1","5.5.1+dfsg-16ubuntu7.2","5.5.1+dfsg-16ubuntu7.5","5.5.1+dfsg-16ubuntu7.6","5.5.1+dfsg-16ubuntu7.7","5.5.1+dfsg-16ubuntu7.7+esm1","5.5.1+dfsg-16ubuntu7.7+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"libqt5concurrent5","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_name":"libqt5core5a","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2","binary_name":"libqt5dbus5"},{"binary_name":"libqt5gui5","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_name":"libqt5libqgtk2","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_name":"libqt5network5","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2","binary_name":"libqt5opengl5"},{"binary_name":"libqt5printsupport5","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2","binary_name":"libqt5sql5"},{"binary_name":"libqt5sql5-mysql","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_name":"libqt5sql5-odbc","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2","binary_name":"libqt5sql5-psql"},{"binary_name":"libqt5sql5-sqlite","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_name":"libqt5sql5-tds","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_name":"libqt5test5","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2","binary_name":"libqt5widgets5"},{"binary_name":"libqt5xml5","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_name":"qt5-default","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_name":"qt5-qmake","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2","binary_name":"qt5-qmake-arm-linux-gnueabihf"},{"binary_name":"qtbase5-dev-tools","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_name":"qtbase5-doc-html","binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2"},{"binary_version":"5.5.1+dfsg-16ubuntu7.7+esm2","binary_name":"qtbase5-examples"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9499.json"}},{"package":{"name":"qtbase-opensource-src","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/qtbase-opensource-src?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.9.1+dfsg-10ubuntu1","5.9.1+dfsg-10ubuntu2","5.9.2+dfsg-4ubuntu6","5.9.3+dfsg-0ubuntu1","5.9.3+dfsg-0ubuntu3","5.9.3+dfsg-0ubuntu4","5.9.4+dfsg-0ubuntu3","5.9.4+dfsg-0ubuntu4","5.9.5+dfsg-0ubuntu1","5.9.5+dfsg-0ubuntu2","5.9.5+dfsg-0ubuntu2.1","5.9.5+dfsg-0ubuntu2.3","5.9.5+dfsg-0ubuntu2.4","5.9.5+dfsg-0ubuntu2.5","5.9.5+dfsg-0ubuntu2.6","5.9.5+dfsg-0ubuntu2.6+esm1","5.9.5+dfsg-0ubuntu2.6+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"libqt5concurrent5","binary_version":"5.9.5+dfsg-0ubuntu2.6+esm2"},{"binary_name":"libqt5core5a","binary_version":"5.9.5+dfsg-0ubuntu2.6+esm2"},{"binary_name":"libqt5dbus5","binary_version":"5.9.5+dfsg-0ubuntu2.6+esm2"},{"binary_name":"libqt5gui5","binary_version":"5.9.5+dfsg-0ubuntu2.6+esm2"},{"binary_name":"libqt5network5","binary_version":"5.9.5+dfsg-0ubuntu2.6+esm2"},{"binary_name":"libqt5opengl5","binary_version":"5.9.5+dfsg-0ubuntu2.6+esm2"},{"binary_version":"5.9.5+dfsg-0ubuntu2.6+esm2","binary_name":"libqt5printsupport5"},{"binary_version":"5.9.5+dfsg-0ubuntu2.6+esm2","binary_name":"libqt5sql5"},{"binary_name":"libqt5sql5-ibase","binary_version":"5.9.5+dfsg-0ubuntu2.6+esm2"},{"binary_name":"libqt5sql5-mysql","binary_version":"5.9.5+dfsg-0ubuntu2.6+esm2"},{"binary_name":"libqt5sql5-odbc","binary_version":"5.9.5+dfsg-0ubuntu2.6+esm2"},{"binary_version":"5.9.5+dfsg-0ubuntu2.6+esm2","binary_name":"libqt5sql5-psql"},{"binary_name":"libqt5sql5-sqlite","binary_version":"5.9.5+dfsg-0ubuntu2.6+esm2"},{"binary_name":"libqt5sq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