CVE-2026-25749

Published: February 10, 2026Last modified: February 10, 2026

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.

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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