PT-2026-52472 · Vim · Vim

Published 2026-06-25 · Updated 2026-06-25 · CVE-2026-55693

Mitre

CVSS v4.0

5.7

Medium

Base vector

AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U

Vim is an open source, command line text editor. Prior to 9.2.0653, the tree count words() function in src/spellfile.c fills in the word-count fields of a spell-file word trie by walking it iteratively with a depth counter. The counter is bounded only by the trie structure itself; it is never checked against the size of the fixed MAXWLEN-element stack arrays it indexes (arridx[], curi[], wordcount[]). A crafted .spl/.sug file pair, loaded when the user invokes spell suggestion, can drive the descent arbitrarily deep, so the function writes past the end of those arrays. This is a stack out-of-bounds write that corrupts the call frame and crashes the editor. This vulnerability is fixed in 9.2.0653.

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2026-55693

Affected Products

Vim

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-55693 · Security Note
• https://github.com/vim/vim/security/advisories/GHSA-wgh4-64f7-q3jq · Note
• https://github.com/vim/vim/releases/tag/v9.2.0653 · Note
• https://github.com/vim/vim/commit/a80874d9b84a01040e3d1aef2d4a59e1934dafb7 · Note