CVE-2026-25749

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.

The following products are affected by CVE-2026-25749 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-25749.

URL	Resource
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
https://nvd.nist.gov/vuln/detail/CVE-2026-25749
https://www.cve.org/CVERecord?id=CVE-2026-25749