# CVE-2026-57452: Vim out-of-bounds read in libsodium-encrypted file parsing

Source: https://junglewise.ai/threats/cve-2026-57452-vim-out-of-bounds-read-in-libsodium-encrypted-file-parsing  
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-2026-57452 · Severity: medium · CVSS 5.5 · Published 2026-06-25

Vim is a widely used open-source text editor. A vulnerability exists where opening a specially crafted, encrypted file can cause the application to crash. This occurs when the file uses specific encryption methods and has an unexpectedly short content body, leading to a denial of service for the user.

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

## Quick answers

**Is CVE-2026-57452 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-57452 being exploited in the wild.

**How severe is CVE-2026-57452?** Medium severity, with a CVSS score of 5.5, published 25 June 2026.

**Which products and versions are affected?** Vim < 9.2.0671.

**Is there a fix for CVE-2026-57452?** A patch was published on 2026-06-18: Patch 9.2.0671 released. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-57452 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-57452?** 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 integer underflow vulnerability exists in Vim's handling of libsodium-encrypted files (VimCrypt~04! and VimCrypt~05!). The function crypt_get_header_len() fails to validate that the encrypted body length is at least as large as the libsodium secretstream header. In crypt_sodium_buffer_decode(), a subtraction operation on a size_t variable underflows when the body is too short, resulting in a very large length value being passed to crypto_secretstream_xchacha20poly1305_pull(). This causes an out-of-bounds read and a subsequent application crash. Exploitation requires the +sodium feature to be enabled and user interaction to open a crafted file and provide a decryption key. The issue is fixed in version 9.2.0671.

## Affected products

- Vim Vim < 9.2.0671

## Timeline

- 2026-06-17: disclosed: Date listed in security advisory description.
- 2026-06-18: patched: Patch 9.2.0671 released.
- 2026-06-25: advisory: NVD and GitHub advisory published.

## References

- [https://github.com/vim/vim/commit/c8777cec25dcfae89c42e9aff51af61f71c5745f](https://github.com/vim/vim/commit/c8777cec25dcfae89c42e9aff51af61f71c5745f)
- [https://github.com/vim/vim/releases/tag/v9.2.0671](https://github.com/vim/vim/releases/tag/v9.2.0671)
- [https://github.com/vim/vim/security/advisories/GHSA-c4j9-wr9j-4486](https://github.com/vim/vim/security/advisories/GHSA-c4j9-wr9j-4486)

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