Vulnerability Description
Vim is an open source, command line text editor. Prior to 9.2.0662, the dump_prefixes() function in src/spell.c walks a spell-file prefix trie iteratively with a depth counter while dumping the prefixes that apply to a word. 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 (prefix[], arridx[], curi[]). A crafted .spl file, loaded when the user dumps the word list, 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 9.2.0662.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Vim | Vim | < 9.2.0662 |
Related Weaknesses (CWE)
References
- https://github.com/vim/vim/commit/8325b193bba5f01e7a7d8241fPatch
- https://github.com/vim/vim/releases/tag/v9.2.0662Product
- https://github.com/vim/vim/security/advisories/GHSA-qm9w-fmpj-879hVendor Advisory
FAQ
What is CVE-2026-55892?
CVE-2026-55892 is a vulnerability with a CVSS score of 5.5 (MEDIUM). Vim is an open source, command line text editor. Prior to 9.2.0662, the dump_prefixes() function in src/spell.c walks a spell-file prefix trie iteratively with a depth counter while dumping the prefix...
How severe is CVE-2026-55892?
CVE-2026-55892 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55892?
Check the references section above for vendor advisories and patch information. Affected products include: Vim Vim.