CVE-2026-55693

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 v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/vim/vim/commit/a80874d9b84a01040e3d1aef2d4a59e1934dafb7	Patch
https://github.com/vim/vim/releases/tag/v9.2.0653	Product
https://github.com/vim/vim/security/advisories/GHSA-wgh4-64f7-q3jq	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:vim:vim:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-06-25 16:16

Updated : 2026-06-26 14:17

NVD link : CVE-2026-55693

Mitre link : CVE-2026-55693

CVE.ORG link : CVE-2026-55693

JSON object : View

Products Affected

vim

vim

CWE

CWE-787

Out-of-bounds Write

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