VulnerabilityAnalyzed

CVE-2026-25749

Prior to version 9.1.2132, a heap buffer overflow vulnerability exists in Vim's tag file resolution logic when processing the 'helpfile' option.

MEDIUM 6.6EPSS 0.27%

Does this matter?

Lower severity and a low EPSS score (0.27%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 6.6 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H
EPSS: 0.27% probability · 18th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-122
Affected: neovim/neovim · vim/vim
Source: security-advisories@github.com

EPSS trend

EPSS 0.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

https://github.com/vim/vim/commit/0714b15940b245108e6e9d7aa2260dd849a26fa9Patch
https://github.com/vim/vim/releases/tag/v9.1.2132Product
https://github.com/vim/vim/security/advisories/GHSA-5w93-4g67-mm43Exploit, Patch, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.