{"id":"DEBIAN-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":"2026-09-01T16:06:48.800255570Z","published":"2026-06-11T19:16:47.627Z","upstream":["CVE-2026-52859"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-52859"}],"affected":[{"package":{"name":"vim","ecosystem":"Debian:12","purl":"pkg:deb/debian/vim?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:9.0.1378-2","2:9.0.1378-2+deb12u1","2:9.0.1378-2+deb12u2","2:9.0.1658-1","2:9.0.1672-1","2:9.0.1894-1","2:9.0.2018-1","2:9.0.2087-1","2:9.0.2103-1","2:9.0.2116-1","2:9.0.2189-1","2:9.1.0-1","2:9.1.0016-1","2:9.1.0199-1","2:9.1.0374-1","2:9.1.0377-1","2:9.1.0496-1","2:9.1.0698-1","2:9.1.0709-1","2:9.1.0709-2","2:9.1.0777-1","2:9.1.0861-1","2:9.1.0967-1","2:9.1.0967-2","2:9.1.1113-1","2:9.1.1230-1","2:9.1.1230-2","2:9.1.1385-1","2:9.1.1766-1","2:9.1.1829-1","2:9.1.1846-1","2:9.1.1882-1","2:9.1.2103-1","2:9.1.2141-1","2:9.2.0119-1","2:9.2.0136-1","2:9.2.0218-1","2:9.2.0315-1","2:9.2.0338-1","2:9.2.0355-1","2:9.2.0428-1","2:9.2.0461-1","2:9.2.0524-1","2:9.2.0782-1","2:9.2.0858-1"],"ecosystem_specific":{"urgency":"unimportant"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-52859.json"}},{"package":{"name":"vim","ecosystem":"Debian:13","purl":"pkg:deb/debian/vim?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:9.1.1230-2","2:9.1.1385-1","2:9.1.1766-1","2:9.1.1829-1","2:9.1.1846-1","2:9.1.1882-1","2:9.1.2103-1","2:9.1.2141-1","2:9.2.0119-1","2:9.2.0136-1","2:9.2.0218-1","2:9.2.0315-1","2:9.2.0338-1","2:9.2.0355-1","2:9.2.0428-1","2:9.2.0461-1","2:9.2.0524-1","2:9.2.0782-1","2:9.2.0858-1"],"ecosystem_specific":{"urgency":"unimportant"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-52859.json"}},{"package":{"name":"vim","ecosystem":"Debian:14","purl":"pkg:deb/debian/vim?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:9.2.0782-1"}]}],"versions":["2:9.1.1230-2","2:9.1.1385-1","2:9.1.1766-1","2:9.1.1829-1","2:9.1.1846-1","2:9.1.1882-1","2:9.1.2103-1","2:9.1.2141-1","2:9.2.0119-1","2:9.2.0136-1","2:9.2.0218-1","2:9.2.0315-1","2:9.2.0338-1","2:9.2.0355-1","2:9.2.0428-1","2:9.2.0461-1","2:9.2.0524-1"],"ecosystem_specific":{"urgency":"unimportant"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-52859.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"}]}