# CVE-2026-57451: Vim out-of-bounds read in get_text_props via crafted undo file

Source: https://junglewise.ai/threats/cve-2026-57451-vim-out-of-bounds-read-in-get-text-props-via-crafted-undo-file  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-25. Updated: 2026-06-25  
License: CC BY 4.0 with a link back

CVE-2026-57451 · Severity: medium · CVSS 5.3 · Published 2026-06-25

Vim is a widely used open-source text editor. A vulnerability in how it handles text properties could allow a specially crafted 'undo' file to cause the editor to crash or potentially leak sensitive information from memory. This occurs when a user opens a malicious file and performs an 'undo' action, which could disrupt operations or expose private data to an attacker.

Technologies: [Vim](https://junglewise.ai/threats/technologies/vim). Vendors: [Vim](https://junglewise.ai/threats/vendors/vim).

## Quick answers

**Is CVE-2026-57451 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-57451 being exploited in the wild.

**How severe is CVE-2026-57451?** Medium severity, with a CVSS score of 5.3, published 25 June 2026.

**Which products and versions are affected?** Vim < 9.2.0670.

**Is there a fix for CVE-2026-57451?** A patch was published on 2026-06-17: Vim patch 9.2.0670 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-57451 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-57451?** Check whether you run Vim at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An out-of-bounds read vulnerability exists in Vim's text property handling within `src/textprop.c`. The function `get_text_props()` reads a 16-bit property count from a line's buffer but fails to validate this count against the actual remaining buffer size. An attacker can provide a crafted undo file (`.un~`) that, when loaded, specifies a large property count for a line with minimal data. Subsequent operations that iterate over these properties, such as screen redraws or `prop_list()` calls, will read past the allocated buffer. This can result in a denial-of-service (crash) or the disclosure of adjacent memory contents. The attack requires the 'undofile' feature to be enabled and user interaction to trigger an undo operation on a malicious file pair. The issue is resolved in version 9.2.0670.

## Affected products

- Vim Vim < 9.2.0670

## Timeline

- 2026-06-17: patched: Vim patch 9.2.0670 released
- 2026-06-17: advisory: GitHub Security Advisory published
- 2026-06-25: disclosed: CVE published to NVD

## References

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

## Related threats

- [Vim is an open source, command line text editor. Prior to 9.2.0845, StructMembers() in runtime/autoload/ccomplete.vim…](https://junglewise.ai/threats/cve-2026-73073-vim-is-an-open-source-command-line-text-editor-prior-to-9-2-0845)
- [Vim netrw code injection via menu construction](https://junglewise.ai/threats/cve-2026-73078-vim-netrw-code-injection-via-menu-construction)
- [Vim shell filetype plugin OS command injection via keyword lookup](https://junglewise.ai/threats/cve-2026-73077-vim-shell-filetype-plugin-os-command-injection-via-keyword-lookup)
- [Vim vimball arbitrary command execution via .VimballRecord](https://junglewise.ai/threats/cve-2026-73076-vim-vimball-arbitrary-command-execution-via-vimballrecord)
- [Vim out-of-bounds access in popup opacity handling](https://junglewise.ai/threats/cve-2026-73075-vim-out-of-bounds-access-in-popup-opacity-handling)