What’s Vulnerable › Vulnerabilities

CVE-2026-25749: Heap Overflow in Vim

• Severity: medium (CVSS 6.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-06 · updated 2026-06-17
• Weakness: CWE-122

Description

Vim is an open source, command line text editor. Prior to version 9.1.2132, a heap buffer overflow vulnerability exists in Vim's tag file resolution logic when processing the 'helpfile' option. The vulnerability is located in the get_tagfname() function in src/tag.c. When processing help file tags, Vim copies the user-controlled 'helpfile' option value into a fixed-size heap buffer of MAXPATHL + 1 bytes (typically 4097 bytes) using an unsafe STRCPY() operation without any bounds checking. This issue has been patched in version 9.1.2132.

Affected products

• Neovim: through 0.11.6
• vim/vim: before 9.1.2132 — fixed in 9.1.2132

How to fix

Upgrade to a fixed version: vim/vim 9.1.2132. Check the vendor advisory for mitigations.

References

• https://github.com/vim/vim/commit/0714b15940b245108e6e9d7aa2260dd849a26fa9
• https://github.com/vim/vim/releases/tag/v9.1.2132
• https://github.com/vim/vim/security/advisories/GHSA-5w93-4g67-mm43

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