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6.6
MEDIUM CVSS 3.1
CVE-2026-25749
Heap Overflow in Vim
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.

INFO

Published Date :

Feb. 6, 2026, 11:15 p.m.

Last Modified :

Feb. 20, 2026, 3:45 p.m.

Remotely Exploit :

No

Source :

[email protected]
Affected Products

The following products are affected by CVE-2026-25749 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Vim vim
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
Solution
Update Vim to version 9.1.2132 or later to fix a heap buffer overflow in tag file resolution.
  • Update Vim to version 9.1.2132 or a later release.
  • Ensure the 'helpfile' option is not set to a malicious value.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-25749.

URL Resource
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
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-25749 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-25749 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-25749 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-25749 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Feb. 20, 2026

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:vim:vim:*:*:*:*:*:*:*:* versions up to (excluding) 9.1.2132
    Added Reference Type GitHub, Inc.: https://github.com/vim/vim/commit/0714b15940b245108e6e9d7aa2260dd849a26fa9 Types: Patch
    Added Reference Type GitHub, Inc.: https://github.com/vim/vim/releases/tag/v9.1.2132 Types: Product
    Added Reference Type GitHub, Inc.: https://github.com/vim/vim/security/advisories/GHSA-5w93-4g67-mm43 Types: Exploit, Patch, Vendor Advisory
  • New CVE Received by [email protected]

    Feb. 06, 2026

    Action Type Old Value New Value
    Added 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.
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H
    Added CWE CWE-122
    Added Reference https://github.com/vim/vim/commit/0714b15940b245108e6e9d7aa2260dd849a26fa9
    Added Reference https://github.com/vim/vim/releases/tag/v9.1.2132
    Added Reference https://github.com/vim/vim/security/advisories/GHSA-5w93-4g67-mm43
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 6.6
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact