Out-of-bounds Write Affecting vim-debugsource package, versions <2:9.2.597-1.amzn2023.0.1


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.3% (22nd percentile)

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  • Snyk IDSNYK-AMZN2023-VIMDEBUGSOURCE-17415469
  • published23 Jun 2026
  • disclosed11 Jun 2026

Introduced: 11 Jun 2026

NewCVE-2026-52859  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 vim-debugsource to version 2:9.2.597-1.amzn2023.0.1 or higher.
This issue was patched in ALAS2023-2026-1862.

NVD Description

Note: Versions mentioned in the description apply only to the upstream vim-debugsource package and not the vim-debugsource package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 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