Medium 5.7Published Jun 25, 2026

CVE-2026-55693Vim: Out-of-bounds Write in Spell File Word Count

Updated under an hour ago (Oct 26, 2026, 6:20 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.7 MEDIUM (v4.0, CNA)CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jun 26, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

vim vim vim:vim (from the name)	before 9.2.0653	CNA record
vim vim vim:vim	before 9.2.0653	NVD

References

https://github.com/vim/vim/security/advisories/GHSA-wgh4-64f7-q3jqx-refsource-confirm, vendor-advisory
https://github.com/vim/vim/commit/a80874d9b84a01040e3d1aef2d4a59e1934dafb7x-refsource-misc, patch
https://github.com/vim/vim/releases/tag/v9.2.0653x-refsource-misc, product

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.