{"id":"UBUNTU-CVE-2026-54055","details":"Kitty is a cross-platform GPU based terminal. In versions prior to 0.47.2, a local privilege escalation vulnerability exists in kitty's file transmission protocol where a child process running in the terminal can write to arbitrary files on the filesystem by exploiting a TOCTOU (Time-of-Check-Time-of-Use) race condition between symlink validation and file creation. The `os.open()` call used to create files does not use `O_NOFOLLOW`, allowing an attacker to create a symlink between the initial stat check and the actual file open, causing the write to follow the symlink to an arbitrary destination. Version 0.47.2 fixes the issue.","modified":"2026-09-15T20:16:36.014670218Z","published":"2026-06-12T20:16:00Z","related":["USN-8763-1"],"upstream":["CVE-2026-54055"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-54055"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-54055"},{"type":"REPORT","url":"https://github.com/kovidgoyal/kitty/security/advisories/GHSA-q446-x7q6-vcxh"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8763-1"}],"affected":[{"package":{"name":"kitty","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/kitty?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.32.2-1ubuntu0.4+esm2"}]}],"versions":["0.26.5-3ubuntu2","0.26.5-5ubuntu1","0.31.0-3","0.31.0-4","0.32.2-1","0.32.2-1build2","0.32.2-1build3","0.32.2-1ubuntu0.1","0.32.2-1ubuntu0.2","0.32.2-1ubuntu0.3","0.32.2-1ubuntu0.4","0.32.2-1ubuntu0.4+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"kitty","binary_version":"0.32.2-1ubuntu0.4+esm2"},{"binary_version":"0.32.2-1ubuntu0.4+esm2","binary_name":"kitty-shell-integration"},{"binary_name":"kitty-terminfo","binary_version":"0.32.2-1ubuntu0.4+esm2"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54055.json"}},{"package":{"name":"kitty","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/kitty?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.39.1-1","0.41.1-2","0.41.1-2+deb13u1build0.25.10.1"],"ecosystem_specific":{"binaries":[{"binary_name":"kitty","binary_version":"0.41.1-2+deb13u1build0.25.10.1"},{"binary_name":"kitty-shell-integration","binary_version":"0.41.1-2+deb13u1build0.25.10.1"},{"binary_name":"kitty-terminfo","binary_version":"0.41.1-2+deb13u1build0.25.10.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54055.json"}},{"package":{"name":"kitty","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/kitty?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.45.0-1ubuntu0.1~esm2"}]}],"versions":["0.41.1-2","0.43.1-1","0.44.0-1","0.45.0-1","0.45.0-1build1","0.45.0-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.45.0-1ubuntu0.1~esm2","binary_name":"kitty"},{"binary_version":"0.45.0-1ubuntu0.1~esm2","binary_name":"kitty-shell-integration"},{"binary_version":"0.45.0-1ubuntu0.1~esm2","binary_name":"kitty-terminfo"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54055.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L"},{"type":"Ubuntu","score":"medium"}]}