CVE-2025-55157: vim Use-After-Free — Fix

Description

Vim is an open source, command line text editor. In versions from 9.1.1231 to before 9.1.1400, When processing nested tuples in Vim script, an error during evaluation can trigger a use-after-free in Vim’s internal tuple reference management. Specifically, the tuple_unref() function may access already freed memory due to improper lifetime handling, leading to memory corruption. The exploit requires direct user interaction, as the script must be explicitly executed within Vim. This issue has been patched in version 9.1.1400.

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CVSS v3.1 Score

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
vim	vim	9.1.1231 — 9.1.1400

References

Advisories & Patches

https://github.com/vim/vim/commit/1307743697bbc46e1518abfea7f89caa95bcaf97 https://github.com/vim/vim/releases/tag/v9.1.1400 https://github.com/vim/vim/security/advisories/GHSA-3r4f-mm4w-wgg6

Frequently Asked Questions

What is CVE-2025-55157? +

Vim is an open source, command line text editor. In versions from 9.1.1231 to before 9.1.1400, When processing nested tuples in Vim script, an error during evaluation can trigger a use-after-free in Vim’s internal tuple reference management. Specifically, the tuple_unref() function may access already freed memory due to improper lifetime handling, leading to memory corruption. The exploit requires direct user interaction, as the script must be explicitly executed within Vim. This issue has been patched in version 9.1.1400. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-55157? +

CVE-2025-55157 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-55157? +

CVE-2025-55157 affects products from vim, specifically: vim. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-55157? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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