PT-2026-48722 · Vim · Vim

Published 2026-06-11 · Updated 2026-06-11 · CVE-2026-52859

Mitre

CVSS v4.0

6.9

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

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.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-52859

Affected Products

Vim

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-52859 · Security Note
• https://github.com/vim/vim/commit/63680c6d3d52477817b49cd1a66e7aabe8a7aa19 · Note
• https://github.com/vim/vim/releases/tag/v9.2.0565 · Note
• https://github.com/vim/vim/security/advisories/GHSA-47gw-8gc3-mgcm · Note