{"id":"UBUNTU-CVE-2026-52859","details":"Vim is an open source, command line text editor. Prior to version 9.2.0565, the update_snapshot() function in src/terminal.c copies the visible terminal screen into the scrollback buffer when a snapshot is taken. For each screen cell it walks the cell's chars[] array with no upper bound, stopping only when it encounters a NUL terminator. When a cell legitimately fills all VTERM_MAX_CHARS_PER_CELL (6) slots — a base character plus five combining marks — the bundled libvterm returns the array without a terminating NUL, so the loop reads past the fixed six-element array and appends the out-of-bounds values to a buffer reserved for only six characters. A program whose output is rendered inside a :terminal window can trigger this with a short byte sequence and no Vim scripting, leading to a crash. This issue has been patched in version 9.2.0565.","modified":"2026-06-22T20:06:39.444565739Z","published":"2026-06-11T19:16:00Z","related":["USN-8451-1"],"upstream":["CVE-2026-52859"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-52859"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-52859"},{"type":"REPORT","url":"https://github.com/vim/vim/security/advisories/GHSA-47gw-8gc3-mgcm"},{"type":"REPORT","url":"https://github.com/vim/vim/commit/63680c6d3d52477817b49cd1a66e7aabe8a7aa19"},{"type":"REPORT","url":"https://github.com/vim/vim/releases/tag/v9.2.0565"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8451-1"}],"affected":[{"package":{"name":"vim","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/vim?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:8.0.1453-1ubuntu1.13+esm20"}]}],"versions":["2:8.0.0197-4ubuntu5","2:8.0.1144-1ubuntu1","2:8.0.1401-1ubuntu1","2:8.0.1401-1ubuntu2","2:8.0.1401-1ubuntu3","2:8.0.1453-1ubuntu1","2:8.0.1453-1ubuntu1.1","2:8.0.1453-1ubuntu1.3","2:8.0.1453-1ubuntu1.4","2:8.0.1453-1ubuntu1.6","2:8.0.1453-1ubuntu1.7","2:8.0.1453-1ubuntu1.8","2:8.0.1453-1ubuntu1.9","2:8.0.1453-1ubuntu1.10","2:8.0.1453-1ubuntu1.11","2:8.0.1453-1ubuntu1.12","2:8.0.1453-1ubuntu1.13","2:8.0.1453-1ubuntu1.13+esm1","2:8.0.1453-1ubuntu1.13+esm3","2:8.0.1453-1ubuntu1.13+esm4","2:8.0.1453-1ubuntu1.13+esm5","2:8.0.1453-1ubuntu1.13+esm6","2:8.0.1453-1ubuntu1.13+esm7","2:8.0.1453-1ubuntu1.13+esm8","2:8.0.1453-1ubuntu1.13+esm9","2:8.0.1453-1ubuntu1.13+esm10","2:8.0.1453-1ubuntu1.13+esm11","2:8.0.1453-1ubuntu1.13+esm12","2:8.0.1453-1ubuntu1.13+esm13","2:8.0.1453-1ubuntu1.13+esm14","2:8.0.1453-1ubuntu1.13+esm15","2:8.0.1453-1ubuntu1.13+esm16","2:8.0.1453-1ubuntu1.13+esm17","2:8.0.1453-1ubuntu1.13+esm18","2:8.0.1453-1ubuntu1.13+esm19"],"ecosystem_specific":{"availability":"Available 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