Vulnerability Description
Vim is an open source, command line text editor. From 9.1.0011 to before 9.2.0137, Vim's NFA regex compiler, when encountering a collection containing a combining character as the endpoint of a character range (e.g. [0-0\u05bb]), incorrectly emits the composing bytes of that character as separate NFA states. This corrupts the NFA postfix stack, resulting in NFA_START_COLL having a NULL out1 pointer. When nfa_max_width() subsequently traverses the compiled NFA to estimate match width for the look-behind assertion, it dereferences state->out1->out without a NULL check, causing a segmentation fault. This vulnerability is fixed in 9.2.0137.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Vim | Vim | >= 9.1.0011, < 9.1.0137 |
Related Weaknesses (CWE)
References
- https://github.com/vim/vim/commit/36d6e87542cf823d833e451e09a90ee429899cecPatch
- https://github.com/vim/vim/releases/tag/v9.2.0137Release Notes
- https://github.com/vim/vim/security/advisories/GHSA-9phh-423r-778rVendor Advisory
FAQ
What is CVE-2026-32249?
CVE-2026-32249 is a vulnerability with a CVSS score of 5.3 (MEDIUM). Vim is an open source, command line text editor. From 9.1.0011 to before 9.2.0137, Vim's NFA regex compiler, when encountering a collection containing a combining character as the endpoint of a charac...
How severe is CVE-2026-32249?
CVE-2026-32249 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-32249?
Check the references section above for vendor advisories and patch information. Affected products include: Vim Vim.