CVE-2026-25749

A flaw was found in Vim, an open source, command line text editor. This heap buffer overflow vulnerability exists in the tag file resolution logic when processing the 'helpfile' option. A local user could exploit this by providing a specially crafted 'helpfile' option value, leading to a heap buffer overflow. This could result in arbitrary code execution or a denial of service.

This MODERATE impact vulnerability in Vim's tag file resolution logic allows a local attacker to achieve a out-of-bounds write. By providing a specially crafted helpfile option value a local user can trigger a heap buffer overflow, as consequence lead to memory corruption presenting a data integrity impact or leading the vim process to crash resulting in availability impact. Although being non-trivial and very complex, arbitrary code execution is not discarded as worst case scenario.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.