VulnerabilityAnalyzed

CVE-2026-32249

This corrupts the NFA postfix stack, resulting in NFA_START_COLL having a NULL out1 pointer.

MEDIUM 5.5EPSS 0.13%

Does this matter?

Lower severity and a low EPSS score (0.13%). Track it; it rarely justifies an emergency change on its own.

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 3.1: 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS: 0.13% probability · 3th percentile
CISA KEV: Not listed
Weakness: CWE-476
Affected: vim/vim
Source: security-advisories@github.com

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.