{"id":"DEBIAN-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":"2026-09-14T17:03:38.932960190Z","published":"2026-07-21T14:16:35.843Z","upstream":["CVE-2026-9499"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-9499"}],"affected":[{"package":{"name":"qt6-5compat","ecosystem":"Debian:12","purl":"pkg:deb/debian/qt6-5compat?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.10.2-1","6.10.2-2","6.10.2-3","6.10.2-4","6.11.2-1","6.4.2-1","6.4.2-2","6.4.2-3","6.4.2-4","6.6.1-1","6.6.1-2","6.6.2-1","6.6.2-2","6.7.2-1","6.7.2-2","6.7.2-3","6.8.2-1","6.8.2-2","6.8.2-3","6.9.1-1","6.9.1-2","6.9.2-1","6.9.2-2","6.9.2-3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9499.json"}},{"package":{"name":"qt6-5compat","ecosystem":"Debian:13","purl":"pkg:deb/debian/qt6-5compat?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.10.2-1","6.10.2-2","6.10.2-3","6.10.2-4","6.11.2-1","6.8.2-3","6.9.1-1","6.9.1-2","6.9.2-1","6.9.2-2","6.9.2-3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9499.json"}},{"package":{"name":"qt6-5compat","ecosystem":"Debian:14","purl":"pkg:deb/debian/qt6-5compat?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.10.2-4"}]}],"versions":["6.10.2-1","6.10.2-2","6.10.2-3","6.8.2-3","6.9.1-1","6.9.1-2","6.9.2-1","6.9.2-2","6.9.2-3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9499.json"}},{"package":{"name":"qtbase-opensource-src","ecosystem":"Debian:12","purl":"pkg:deb/debian/qtbase-opensource-src?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.15.10+dfsg-1","5.15.10+dfsg-2","5.15.10+dfsg-3","5.15.10+dfsg-4","5.15.10+dfsg-5","5.15.10+dfsg-6","5.15.10+dfsg-7","5.15.10+dfsg-7.1","5.15.10+dfsg-7.2","5.15.11+dfsg-1","5.15.12+dfsg-1","5.15.12+dfsg-2","5.15.12+dfsg-3","5.15.13+dfsg-1","5.15.13+dfsg-2","5.15.13+dfsg-3","5.15.13+dfsg-4","5.15.14+dfsg-1","5.15.15+dfsg-1","5.15.15+dfsg-2","5.15.15+dfsg-3","5.15.15+dfsg-4","5.15.15+dfsg-5","5.15.15+dfsg-6","5.15.16+dfsg-1","5.15.16+dfsg-2","5.15.17+dfsg-1","5.15.17+dfsg-2","5.15.17+dfsg-3","5.15.17+dfsg-4","5.15.17+dfsg-5","5.15.17+dfsg-6","5.15.17+dfsg-7","5.15.17+dfsg-8","5.15.18+dfsg-1","5.15.18+dfsg-2","5.15.19+dfsg-1","5.15.19+dfsg-2","5.15.19+dfsg-3","5.15.19+dfsg-4","5.15.8+dfsg-11","5.15.8+dfsg-11+deb12u1","5.15.8+dfsg-11+deb12u2","5.15.8+dfsg-11+deb12u3","5.15.8+dfsg-12","5.15.8+dfsg-13","5.15.9+dfsg-1","5.15.9+dfsg-2","5.15.9+dfsg-3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9499.json"}},{"package":{"name":"qtbase-opensource-src","ecosystem":"Debian:13","purl":"pkg:deb/debian/qtbase-opensource-src?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.15.15+dfsg-6","5.15.15+dfsg-6+deb13u1","5.15.16+dfsg-1","5.15.16+dfsg-2","5.15.17+dfsg-1","5.15.17+dfsg-2","5.15.17+dfsg-3","5.15.17+dfsg-4","5.15.17+dfsg-5","5.15.17+dfsg-6","5.15.17+dfsg-7","5.15.17+dfsg-8","5.15.18+dfsg-1","5.15.18+dfsg-2","5.15.19+dfsg-1","5.15.19+dfsg-2","5.15.19+dfsg-3","5.15.19+dfsg-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9499.json"}},{"package":{"name":"qtbase-opensource-src","ecosystem":"Debian:14","purl":"pkg:deb/debian/qtbase-opensource-src?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.19+dfsg-4"}]}],"versions":["5.15.15+dfsg-6","5.15.16+dfsg-1","5.15.16+dfsg-2","5.15.17+dfsg-1","5.15.17+dfsg-2","5.15.17+dfsg-3","5.15.17+dfsg-4","5.15.17+dfsg-5","5.15.17+dfsg-6","5.15.17+dfsg-7","5.15.17+dfsg-8","5.15.18+dfsg-1","5.15.18+dfsg-2","5.15.19+dfsg-1","5.15.19+dfsg-2","5.15.19+dfsg-3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9499.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}