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Vulnerability record · CVE-2026-25749 · published 6 February 2026

CVE-2026-25749: Neovim heap-based buffer overflow vulnerability

Neovim · Neovim

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.

6.6 CVSS 3.1 Medium EPSS 0.20% · top 91.4% CWE-122 · Heap-based buffer overflow
6.6CVSS 3.1 base score
0.20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
3References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/vim/vim/commit/0714b15940b245108e6e9d7aa2260dd849a26fa9 Patch
https://github.com/vim/vim/releases/tag/v9.1.2132 Product
https://github.com/vim/vim/security/advisories/GHSA-5w93-4g67-mm43 ExploitPatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-20703Vim classic buffer overflow vulnerabilityBuffer Overflow vulnerability in VIM v.8.1.2135 allows a remote attacker to execute arbitrary code via the operand parameter.EPSS 1.5%9.8CVE-2022-3520Vim heap-based buffer overflow vulnerabilityHeap-based Buffer Overflow in GitHub repository vim/vim prior to 9.0.0765.EPSS 1.1%9.8CVE-2022-0318Vim heap-based buffer overflow vulnerabilityHeap-based Buffer Overflow in vim/vim prior to 8.2.EPSS 2.0%9.8CVE-2017-6350Vim integer overflow vulnerabilityAn integer overflow at an unserialize_uep memory allocation site would occur for vim before patch 8.0.0378, if it does not properly validate values f…EPSS 3.2%9.8CVE-2017-6349Vim integer overflow vulnerabilityAn integer overflow at a u_read_undo memory allocation site would occur for vim before patch 8.0.0377, if it does not properly validate values for tr…EPSS 2.7%9.8CVE-2017-5953Vim integer overflow vulnerabilityvim before patch 8.0.0322 does not properly validate values for tree length when handling a spell file, which may result in an integer overflow at a …EPSS 2.8%9.3CVE-2008-6235Vim os command injection vulnerabilityThe Netrw plugin (netrw.vim) in Vim 7.0 and 7.1 allows user-assisted attackers to execute arbitrary commands via shell metacharacters in a filename u…EPSS 3.0%9.3CVE-2008-3076Vim os command injection vulnerabilityThe Netrw plugin 125 in netrw.vim in Vim 7.2a.10 allows user-assisted attackers to execute arbitrary code via shell metacharacters in filenames used …EPSS 9.0%

Source: NIST National Vulnerability Database (record CVE-2026-25749), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.