{"id":"UBUNTU-CVE-2026-54056","details":"Kitty is a cross-platform GPU based terminal. In versions 0.47.0 and 0.47.1, `kitten dnd` can allow a malicious remote drag-and-drop source to overwrite or truncate arbitrary files writable by the local kitty user. Remote `text/uri-list` drops are staged in a temporary directory, but on case-sensitive filesystems duplicate remote basenames are not de-duplicated. An attacker can first create a staged symlink and then send a same-name regular-file entry. The regular-file write uses `utils.CreateAt()` / `openat(O_RDWR|O_CREAT|O_TRUNC)` without `O_NOFOLLOW`, so it follows the attacker-created symlink and writes outside the staging directory before final overwrite confirmation runs. This appears related in class to the file-transfer symlink advisory, but it is a different bug: it affects `kitten dnd` remote drag-and-drop staging, uses different vulnerable code (`kittens/dnd/drop.go` and `tools/utils/file_at_fd.go`), and reproduces on commit `4aa4a5c0567a92553a8c20a88a4352da637fca5d`, after the file-transfer `O_NOFOLLOW` fix. Version 0.47.2 patches the issue.","modified":"2026-09-15T20:16:34.746941688Z","published":"2026-06-12T21:16:00Z","upstream":["CVE-2026-54056"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-54056"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-54056"},{"type":"REPORT","url":"https://github.com/kovidgoyal/kitty/security/advisories/GHSA-r892-cv7q-fw8x"}],"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"}]}],"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","0.15.0-1ubuntu0.2+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"kitty","binary_version":"0.15.0-1ubuntu0.2+esm1"},{"binary_name":"kitty-terminfo","binary_version":"0.15.0-1ubuntu0.2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54056.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"}]}],"versions":["0.19.3-1","0.21.2-1","0.21.2-1build1","0.21.2-1ubuntu0.22.04.1","0.21.2-1ubuntu0.22.04.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.21.2-1ubuntu0.22.04.1+esm1","binary_name":"kitty"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54056.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"}]}],"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","0.32.2-1ubuntu0.4+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.32.2-1ubuntu0.4+esm2","binary_name":"kitty"},{"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"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54056.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_version":"0.41.1-2+deb13u1build0.25.10.1","binary_name":"kitty"},{"binary_name":"kitty-shell-integration","binary_version":"0.41.1-2+deb13u1build0.25.10.1"},{"binary_version":"0.41.1-2+deb13u1build0.25.10.1","binary_name":"kitty-terminfo"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54056.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"}]}],"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","0.45.0-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"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","binary_version":"0.45.0-1ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54056.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L"},{"type":"Ubuntu","score":"medium"}]}