Medium severity · published Feb 27, 2026
CVE-2026-28420
Vim has Heap-based Buffer Overflow and OOB Read in :terminal
4.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VI
vim · vim
< 9.2.0076 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28420
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28420
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
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