CVE-2026-32249

low-risk

Published 2026-03-12

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.

Do I need to act?

0.01% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.3/10 Medium

LOCAL / LOW complexity

Affected Products (1)

Vim

Affected Vendors

Vim

References (3)

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

/ 100

low-risk

Severity 18/34 · Moderate

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal