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CVE-2026-59858: Vim: Arbitrary Code Execution via C Omni-Completion

• Severity: high (CVSS 7.8 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: 2026-07-09 · updated 2026-07-14
• Weakness: CWE-94

Description

Vim is an open source, command line text editor. Prior to 9.2.0735, the C omni-completion script in runtime/autoload/ccomplete.vim interpolates the typeref: or typename: extension field of a tags entry, without escaping, into a :vimgrep pattern that is run through :execute. Because :vimgrep honors the bar as a command separator, a crafted tag field can close the search pattern and append an arbitrary Ex command; opening a hostile .c file whose project tags file contains such an entry and invoking C omni-completion runs that command as the editing user. This issue is fixed in version 9.2.0735.

Affected products

• vim/vim: before 9.2.0735 — fixed in 9.2.0735

How to fix

Upgrade to a fixed version: vim/vim 9.2.0735. Check the vendor advisory for mitigations.

References

• https://github.com/vim/vim/commit/6b611b0d15603c52ebdad17172b0232b4f65704e
• https://github.com/vim/vim/security/advisories/GHSA-mf92-v4xw-j45x

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