Vim up to 9.2.734 Omni Completion ccomplete.vim os command injection

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Vim up to 9.2.734. Impacted is an unknown function of the file runtime/autoload/ccomplete.vim of the component Omni Completion. This manipulation causes os command injection. This vulnerability is handled as CVE-2026-59858. It is possible to launch the attack on the local host. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic was found in Vim up to 9.2.734. Affected by this vulnerability is an unknown functionality of the file runtime/autoload/ccomplete.vim of the component Omni Completion. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-59858 since 07/07/2026. The exploitation appears to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

Upgrading to version 9.2.0735 eliminates this vulnerability.

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Productinfo

Type

• Word Processing Software

Name

• Vim

Version

• 9.2.734

License

• open-source

Website

• Product: https://github.com/vim/vim/

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