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MEDIUM

CVE-2026-28420

Vim has Heap-based Buffer Overflow and OOB Read in :terminal

CVSS v3

4.4

MEDIUM

EPSS Score

0.2 %

exploit probability, as of 2026-10-15

CISA KEV

No

known exploited

Exploitation

none

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • vim-X11AlmaLinux:9all versions · fixed in 2:8.2.2637-26.el9_8.21and 4 other packages
  • vim-X11AlmaLinux:8all versions · fixed in 2:8.0.1763-31.el8_10.7and 4 other packages
  • xxdAlmaLinux:10all versions · fixed in 2:9.1.083-9.el10_2.20and 6 other packages

Vendor advisories

  • CVE-2026-28420 Red Hat Product Security32 products fixed · 14 known affected

    vim: Vim: Information disclosure and denial of service via crafted Unicode characters in terminal emulator

    vim-X11 as a component of Red Hat Enterprise Linux 6 · vim-common as a component of Red Hat Enterprise Linux 6 · vim-enhanced as a component of Red Hat Enterprise Linux 6

  • RHSA-2026:71603 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Update Infrastructure 5.3 security update

  • RHSA-2026:67956 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Update Infrastructure 5.3 security update

  • RHSA-2026:66366 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: vim security update

  • RHSA-2026:66348 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: vim security update

  • RHSA-2026:66336 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: vim security update

Full record on NVD

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Published
2026-02-27
Last Modified
2026-03-04

Frequently asked questions

What is 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.

Is CVE-2026-28420 actively exploited?

Active exploitation of CVE-2026-28420 has not been confirmed. Its EPSS score was 0.2% on 2026-10-15, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-28420?

CVE-2026-28420 has a CVSS v3 base score of 4.4 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L.

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