{"id":"UBUNTU-CVE-2026-33642","details":"Kitty is a cross-platform GPU based terminal. In versions 0.46.2 and below, the handle_compose_command() function in kitty/graphics.c performs bounds validation on composition offsets using unsigned 32-bit arithmetic that is subject to integer wrapping, potentially leading to Heap Buffer Over-Read/Write. An attacker who can write escape sequences to a kitty terminal (e.g., via a malicious file, SSH login banner, or piped content) can supply crafted x_offset/y_offset values that pass the bounds check after wrapping but cause massive out-of-bounds heap memory access in compose_rectangles(). No user interaction is required. No non-default configuration is required. The attacker only needs the ability to produce output in a kitty terminal window. This issue has been fixed in version 0.47.0.","modified":"2026-06-18T00:30:10.746703384Z","published":"2026-05-19T19:16:00Z","related":["USN-8442-1"],"upstream":["CVE-2026-33642"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-33642"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-33642"},{"type":"REPORT","url":"https://github.com/kovidgoyal/kitty/commit/e9661f0f3afb4e4dbffa509adfb3df3c9780ad34"},{"type":"REPORT","url":"https://github.com/kovidgoyal/kitty/security/advisories/GHSA-qfgm-2c64-6x3x"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8442-1"}],"affected":[{"package":{"name":"kitty","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/kitty?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.15.0-1ubuntu0.2+esm1"}]}],"versions":["0.14.3-1","0.14.4-1","0.14.6-1","0.15.0-1","0.15.0-1build1","0.15.0-1ubuntu0.2"],"ecosystem_specific":{"binaries":[{"binary_name":"kitty","binary_version":"0.15.0-1ubuntu0.2+esm1"},{"binary_version":"0.15.0-1ubuntu0.2+esm1","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-2026-33642.json"}},{"package":{"name":"kitty","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/kitty?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.21.2-1ubuntu0.22.04.1+esm1"}]}],"versions":["0.19.3-1","0.21.2-1","0.21.2-1build1","0.21.2-1ubuntu0.22.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.21.2-1ubuntu0.22.04.1+esm1","binary_name":"kitty"}],"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-2026-33642.json"}},{"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+esm1"}]}],"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"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"0.32.2-1ubuntu0.4+esm1","binary_name":"kitty"},{"binary_version":"0.32.2-1ubuntu0.4+esm1","binary_name":"kitty-shell-integration"},{"binary_version":"0.32.2-1ubuntu0.4+esm1","binary_name":"kitty-terminfo"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33642.json"}},{"package":{"name":"kitty","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/kitty?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.41.1-2+deb13u1build0.25.10.1"}]}],"versions":["0.39.1-1","0.41.1-2"],"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"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33642.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~esm1"}]}],"versions":["0.41.1-2","0.43.1-1","0.44.0-1","0.45.0-1","0.45.0-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"kitty","binary_version":"0.45.0-1ubuntu0.1~esm1"},{"binary_version":"0.45.0-1ubuntu0.1~esm1","binary_name":"kitty-shell-integration"},{"binary_name":"kitty-terminfo","binary_version":"0.45.0-1ubuntu0.1~esm1"}],"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-2026-33642.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}