Unrated severityNVD Advisory· Published Feb 6, 2026· Updated Feb 9, 2026
Heap Overflow in Vim
CVE-2026-25749
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.
Affected products
2Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- github.com/vim/vim/commit/0714b15940b245108e6e9d7aa2260dd849a26fa9mitrex_refsource_MISC
- github.com/vim/vim/releases/tag/v9.1.2132mitrex_refsource_MISC
- github.com/vim/vim/security/advisories/GHSA-5w93-4g67-mm43mitrex_refsource_CONFIRM
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