CVE-2026-28421
Received Received - Intake
Heap Buffer Overflow in Vim Swap File Recovery Causes Crash

Publication date: 2026-02-27

Last updated on: 2026-03-04

Assigner: GitHub, Inc.

Description
Vim is an open source, command line text editor. Versions prior to 9.2.0077 have a heap-buffer-overflow and a segmentation fault (SEGV) exist in Vim's swap file recovery logic. Both are caused by unvalidated fields read from crafted pointer blocks within a swap file. Version 9.2.0077 fixes the issue.
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Meta Information
Published
2026-02-27
Last Modified
2026-03-04
Generated
2026-06-16
AI Q&A
2026-02-28
EPSS Evaluated
2026-06-15
NVD
CVE-2026-28421
EUVD
EUVD-2026-9089
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
vim vim to 9.2.0077 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
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Executive Summary

This vulnerability exists in Vim, an open source command line text editor, in versions prior to 9.2.0077. It involves a heap-buffer-overflow and a segmentation fault (SEGV) in Vim's swap file recovery logic. These issues are caused by unvalidated fields that are read from specially crafted pointer blocks within a swap file. The problem is fixed in version 9.2.0077.

Impact Analysis

Exploitation of this vulnerability can lead to a heap-buffer-overflow and segmentation fault, which may cause Vim to crash or behave unpredictably. This could potentially be used by an attacker to execute arbitrary code or cause denial of service when recovering swap files.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, upgrade Vim to version 9.2.0077 or later, as this version contains the fix for the heap-buffer-overflow and segmentation fault issues in the swap file recovery logic.

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