CVE-2026-28420
Heap-Based Buffer Overflow in Vim Terminal Emulator (Unicode
Publication date: 2026-02-27
Last updated on: 2026-03-04
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| vim | vim | to 9.2.0076 (exc) |
Helpful Resources
Exploitability
| 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(). |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
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.