CVE-2026-25749
Medium
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.
SeverityMedium
CVSS6.6
Exploit probability—
ProductNeovim
PublishedFeb 6, 2026
First seenFeb 6, 2026
Weakness typeCWE-122CWE-122
How to fix
Update
- vim vim9.1.2132 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| neovim neovim | v ≤ 0.11.6 | — |
| vim vim | v < 9.1.2132 | 9.1.2132 |
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