CVE-2026-25749

low-risk

Published 2026-02-06

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.

Do I need to act?

0.01% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 6.6/10 Medium

LOCAL / LOW complexity

Affected Products (1)

Vim

Affected Vendors

Vim

References (3)

Patch https://github.com/vim/vim/commit/0714b15940b245108e6e9d7aa2260dd849a26fa9

Product https://github.com/vim/vim/releases/tag/v9.1.2132

Exploit https://github.com/vim/vim/security/advisories/GHSA-5w93-4g67-mm43

/ 100

low-risk

Severity 21/34 · High

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal