CVE-2026-28420
Received Received - Intake
Heap-Based Buffer Overflow in Vim Terminal Emulator (Unicode

Publication date: 2026-02-27

Last updated on: 2026-03-04

Assigner: GitHub, Inc.

Description
Vim is an open source, command line text editor. Prior to version 9.2.0076, a heap-based buffer overflow WRITE and an out-of-bounds READ exist in Vim's terminal emulator when processing maximum combining characters from Unicode supplementary planes. Version 9.2.0076 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-2026-28420
EUVD
EUVD-2026-9088
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
vim vim to 9.2.0076 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.
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 the Vim text editor prior to version 9.2.0076. It involves a heap-based buffer overflow write and an out-of-bounds read in Vim's terminal emulator. These issues occur when processing maximum combining characters from Unicode supplementary planes.

Impact Analysis

The vulnerability can lead to unintended memory writes and reads, which may cause application instability or crashes. It could potentially be exploited to alter data or affect the availability of the Vim editor.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, update Vim to version 9.2.0076 or later, as this version contains the fix for the heap-based buffer overflow and out-of-bounds read issues in the terminal emulator.

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