What’s Vulnerable › Vulnerabilities

CVE-2026-32249: NFA regex engine NULL pointer dereference affects Vim < 9.2.0137

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-12 · updated 2026-07-23
• Weakness: CWE-476

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.

Affected products

• vim/vim: from 9.1.0011 before 9.2.0137 — fixed in 9.2.0137

How to fix

Upgrade to a fixed version: vim/vim 9.2.0137. Check the vendor advisory for mitigations.

References

• https://github.com/vim/vim/commit/36d6e87542cf823d833e451e09a90ee429899cec
• https://github.com/vim/vim/releases/tag/v9.2.0137
• https://github.com/vim/vim/security/advisories/GHSA-9phh-423r-778r

Get alerted when CVE-2026-32249 or the next vulnerability affects your stack