Heap Overflow in Vim

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Summary

CVECVE-2026-25749
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-06 23:15:54 UTC
Updated2026-06-09 18:28:09 UTC
DescriptionVim 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.

Risk And Classification

Primary CVSS: v3.1 6.6 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H

EPSS: 0.002130000 probability, percentile 0.115430000 (date 2026-06-16)

Problem Types: CWE-122 | CWE-122 CWE-122: Heap-based Buffer Overflow

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.6MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H
3.1CNADECLARED6.6MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Neovim Neovim All All All All
Application Vim Vim All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Vim Vim affected < 9.1.2132 Not specified

References

ReferenceSourceLinkTags
github.com/vim/vim/releases/tag/v9.1.2132 [email protected] github.com Product
github.com/vim/vim/commit/0714b15940b245108e6e9d7aa2260dd849a26fa9 [email protected] github.com Patch
github.com/vim/vim/security/advisories/GHSA-5w93-4g67-mm43 [email protected] github.com Exploit, Patch, Vendor Advisory
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