Buffer overflow in Vim
CVE-2026-28420
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.002 (7.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Vim — versions < 9.2.0076
Weakness classification (CWE)
References
- github.com/vim/vim/security/advisories/GHSA-rvj2-jrf9-2phg (Patch, Vendor Advisory)
- github.com/vim/vim/commit/bb6de2105b160e729c34063 (Patch)
- github.com/vim/vim/releases/tag/v9.2.0076 (Product)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-28420?
- CVE-2026-28420 is a medium-severity vulnerability in Vim, classified under Heap-based Buffer Overflow. CVSS score: 4.4/10. Published 2026-02-27.
- How severe is CVE-2026-28420?
- Medium severity. CVSS v3 base score is 4.4 out of 10.