Medium severity · published Mar 12, 2026
CVE-2026-32249
NFA regex engine NULL pointer dereference affects Vim < 9.2.0137
5.5
CVSS
0.1%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VI
vim · vim
>= 9.1.0011, < 9.2.0137 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-32249
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-32249
Patch
https://github.com/vim/vim/commit/36d6e87542cf823d833e451e09a90ee429899cec
Release Notes
https://github.com/vim/vim/releases/tag/v9.2.0137
Vendor Advisory
https://github.com/vim/vim/security/advisories/GHSA-9phh-423r-778r
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