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CVE-2026-55693

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

Published: Jun 25, 2026Updated: Jun 26, 2026 Sources: CVE List NVDCWE-787
7.8HIGH
NVD MITRE
EPSS Score
0.1%
Top 97.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-787

Affected Products

vim
oss-projectaka gvim, vi, vim/vim
vimOn-premDesktop App
Consumer Software / file-utility

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/vim/vim/commit/a80874d9b84a01040e3d1aef2d4a59e1934dafb7
github.com
https://github.com/vim/vim/releases/tag/v9.2.0653
github.com
https://github.com/vim/vim/security/advisories/GHSA-wgh4-64f7-q3jq
github.com
News mentions
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