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.
- Score
- CVSS 3.1 7.8 High
- Status
- Analyzed - security-advisories@github.com
- Published
- 2026-06-25
- Last modified
- 2026-06-26
- Weaknesses
- CWE-787
Affected products
References
- https://github.com/vim/vim/commit/a80874d9b84a01040e3d1aef2d4a59e1934dafb7
- https://github.com/vim/vim/releases/tag/v9.2.0653
- https://github.com/vim/vim/security/advisories/GHSA-wgh4-64f7-q3jq
