Out-of-bounds Read Affecting vim package, versions <2:8.1.2269-1ubuntu5.32+esm8


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.3% (22nd percentile)

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  • Snyk IDSNYK-UBUNTU2004-VIM-17328648
  • published16 Jun 2026
  • disclosed11 Jun 2026

Introduced: 11 Jun 2026

CVE-2026-52859  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Ubuntu:20.04 vim to version 2:8.1.2269-1ubuntu5.32+esm8 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream vim package and not the vim package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1