Vim up to 9.2.0838 Filetype Plugins runtime/ftplugin/sh.vim fnameescape os command injection

Summaryinfo

A vulnerability was found in Vim up to 9.2.0838. It has been declared as problematic. This affects the function fnameescape of the file runtime/ftplugin/sh.vim of the component Filetype Plugins. Executing a manipulation can lead to os command injection. This vulnerability appears as CVE-2026-73077. The attack requires local access. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic was found in Vim up to 9.2.0838. This vulnerability affects the function fnameescape of the file runtime/ftplugin/sh.vim of the component Filetype Plugins. 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. CVE summarizes:

Vim is an open source, command line text editor. Prior to 9.2.0839, the runtime/ftplugin/sh.vim, runtime/ftplugin/zsh.vim, and runtime/ftplugin/ps1.vim filetype plugins pass attacker-controlled Visual-mode selections from K through keywordprg commands without safely separating shell arguments. fnameescape() and PATH_ESC_CHARS do not neutralize shell metacharacters before ShKeywordPrg, ZshKeywordPrg, or GetHelp invokes bash, zsh, or PowerShell, allowing arbitrary operating-system commands to execute with the privileges of the user running Vim. This issue is fixed in version 9.2.0839.

The advisory is available at github.com. This vulnerability was named CVE-2026-73077 since 08/10/2026. The exploitation appears to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Upgrading to version 9.2.0839 eliminates this vulnerability.

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Productinfo

Type

• Word Processing Software

Name

• Vim

Version

• 9.2.0838

License

• open-source

Website

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

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