CVE-2026-28419: Vim has Heap-based Buffer Underflow in Emacs tags parsing

Severity: medium (CVSS 6.6 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-124

Description

Vim is an open source, command line text editor. Prior to version 9.2.0075, a heap-based buffer underflow exists in Vim's Emacs-style tags file parsing logic. When processing a malformed tags file where a delimiter appears at the start of a line, Vim attempts to read memory immediately preceding the allocated buffer. Version 9.2.0075 fixes the issue.

Affected products

vim/vim: before 9.2.0075 — fixed in 9.2.0075

How to fix

Upgrade to a fixed version: vim/vim 9.2.0075. Check the vendor advisory for mitigations.

References

https://github.com/vim/vim/commit/9b7dfa2948c9e1e5e32a5812
https://github.com/vim/vim/releases/tag/v9.2.0075
https://github.com/vim/vim/security/advisories/GHSA-xcc8-r6c5-hvwv
http://www.openwall.com/lists/oss-security/2026/02/27/8

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