CVE-2026-25749: Neovim

Medium severity, CVSS 6.6. EPSS: 0.2% chance of exploitation in the next 30 days.

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

• Neovim Neovim: up to and including 0.11.6
• Vim Vim: before 9.1.2132 (fixed in 9.1.2132)

Published 2026-02-06. Last modified 2026-06-17.