CVE-2026-28420

low-risk

Published 2026-02-27

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.

Do I need to act?

0.01% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 4.4/10 Medium

LOCAL / LOW complexity

Affected Products (1)

Vim

Affected Vendors

Vim

References (4)

Patch https://github.com/vim/vim/commit/bb6de2105b160e729c34063

Product https://github.com/vim/vim/releases/tag/v9.2.0076

Patch https://github.com/vim/vim/security/advisories/GHSA-rvj2-jrf9-2phg

Mailing List http://www.openwall.com/lists/oss-security/2026/02/27/9

/ 100

low-risk

Severity 15/34 · Moderate

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal