CVE-2026-57456

There is a security flaw in Vim. If you use Vim to open a malicious file written by a hacker, and you use the auto-complete feature while typing, the file can secretly force your computer to run unauthorized commands or malware.

This flaw is rated as Important. A vulnerability in Vim's Python omni-completion feature allows for arbitrary code execution. By opening a specially crafted file, a local attacker could execute arbitrary Python code due to improper handling of docstrings during omni-completion, leading to a compromise of the system where Vim is running.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this vulnerability, users should avoid opening untrusted Python files or using Python omni-completion on such files. If Python omni-completion is not required, it can be disabled by adding autocmd FileType python setlocal omnifunc= to your .vimrc file. This will prevent the vulnerable code from being executed. Disabling Python omni-completion will remove the ability to use Ctrl-X Ctrl-O for Python code completion. A restart of Vim is required for the changes to take effect.