CVE-2026-28421: Vim has a heap-buffer-overflow and a segmentation fault

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-27 · updated 2026-06-17
Weakness: CWE-20

Description

Vim is an open source, command line text editor. Versions prior to 9.2.0077 have a heap-buffer-overflow and a segmentation fault (SEGV) exist in Vim's swap file recovery logic. Both are caused by unvalidated fields read from crafted pointer blocks within a swap file. Version 9.2.0077 fixes the issue.

Affected products

vim/vim: before 9.2.0077 — fixed in 9.2.0077

How to fix

Upgrade to a fixed version: vim/vim 9.2.0077. Check the vendor advisory for mitigations.

References

https://github.com/vim/vim/commit/65c1a143c331c886dc28
https://github.com/vim/vim/releases/tag/v9.2.0077
https://github.com/vim/vim/security/advisories/GHSA-r2gw-2x48-jj5p
http://www.openwall.com/lists/oss-security/2026/02/27/10

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