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Fencer Vulns
medium 4.4

CVE-2026-28420 json

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

published 2026-02-27 8 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-9088

cvss
4.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

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.

Patch / fix

  • vim vim 9.2.0076
  • vim Debian 13 2:9.1.1230-2+deb13u1
  • vim Debian 14 2:9.2.0119-1

debian advisories DEBIAN-CVE-2026-28420

  • vim Ubuntu 22.04 LTS 2:8.2.3995-1ubuntu2.26
  • vim Ubuntu 24.04 LTS 2:9.1.0016-1ubuntu7.10
  • vim Ubuntu 25.10 2:9.1.0967-1ubuntu6.1
  • vim Ubuntu 26.04 LTS 2:9.1.2141-1ubuntu2
  • vim Ubuntu Pro 14.04 LTS 2:7.4.052-1ubuntu3.1+esm23
  • vim Ubuntu Pro 16.04 LTS 2:7.4.1689-3ubuntu1.5+esm29
  • vim Ubuntu Pro 18.04 LTS 2:8.0.1453-1ubuntu1.13+esm14
  • vim Ubuntu Pro 20.04 LTS 2:8.1.2269-1ubuntu5.32+esm2

ubuntu advisories UBUNTU-CVE-2026-28420

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • vim RHEL 9 2:8.2.2637-26.el9_8.21
  • vim-X11 RHEL 9 2:8.2.2637-26.el9_8.21
  • vim-common RHEL 9 2:8.2.2637-26.el9_8.21
  • vim-enhanced RHEL 9 2:8.2.2637-26.el9_8.21
  • vim RHEL 8 2:8.0.1763-31.el8_10.7
  • vim-X11 RHEL 8 2:8.0.1763-31.el8_10.7
  • vim-common RHEL 8 2:8.0.1763-31.el8_10.7
  • vim-enhanced RHEL 8 2:8.0.1763-31.el8_10.7

red hat advisories RHSA-2026:66366RHSA-2026:66348RHSA-2026:66336

  • vim SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +4 more 9.2.0110-150000.5.86.1
  • vim SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES 15 SP6-LTSS +7 more 9.2.0110-150500.20.43.1
  • vim SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 9.2.0110-17.59.1

suse advisories SUSE-SU-2026:1051-1SUSE-SU-2026:1095-1SUSE-SU-2026:0910-1

  • xxd AlmaLinux 10 2:9.1.083-9.el10_2.20
  • vim-X11 AlmaLinux 10 2:9.1.083-9.el10_2.20
  • vim-data AlmaLinux 10 2:9.1.083-9.el10_2.20
  • vim-common AlmaLinux 10 2:9.1.083-9.el10_2.20
  • vim-minimal AlmaLinux 10 2:9.1.083-9.el10_2.20
  • vim-enhanced AlmaLinux 10 2:9.1.083-9.el10_2.20
  • vim-filesystem AlmaLinux 10 2:9.1.083-9.el10_2.20
  • vim-X11 AlmaLinux 8 2:8.0.1763-31.el8_10.7

almalinux advisories ALSA-2026:66336ALSA-2026:66348ALSA-2026:66366

  • vim Rocky Linux 10 2:9.1.083-9.el10_2.20
  • vim Rocky Linux 9 2:8.2.2637-26.el9_8.21
  • vim Rocky Linux 8 2:8.0.1763-31.el8_10.7

rocky linux advisories RLSA-2026:66336RLSA-2026:66366RLSA-2026:66348

  • vim Alpine 3.24, Alpine 3.23 9.2.0078-r0

alpine advisories ALPINE-CVE-2026-28420

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • vim Azure Linux 3.0 9.2.0088-1

azure linux advisories AZL-78503

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-28420 updated cvss 4.4

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

  • Red Hat Enterprise Linux 6 vim, vim-X11, vim-common, vim-minimal, vim-enhanced, vim-filesystem Red Hat Enterprise Linux 7 vim, vim-X11, vim-common, vim-minimal, vim-enhanced, vim-filesystem Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 8) vim-X11 8.0.1763-31.el8_10.7, vim-enhanced 8.0.1763-31.el8_10.7
    fixed: vendor fix RHSA-2026:66348
  • Red Hat Enterprise Linux AppStream (v. 9) vim-X11 8.2.2637-26.el9_8.21, vim-enhanced 8.2.2637-26.el9_8.21
    fixed: vendor fix RHSA-2026:66366
  • Red Hat Enterprise Linux AppStream (v. 10) vim-X11 9.1.083-9.el10_2.20, vim-enhanced 9.1.083-9.el10_2.20
    fixed: vendor fix RHSA-2026:66336
  • Red Hat Enterprise Linux BaseOS (v. 8) vim 8.0.1763-31.el8_10.7
    fixed: vendor fix RHSA-2026:66348
  • Red Hat Enterprise Linux BaseOS (v. 9) vim 8.2.2637-26.el9_8.21
    fixed: vendor fix RHSA-2026:66366
  • Red Hat Enterprise Linux BaseOS (v. 10) vim 9.1.083-9.el10_2.20
    fixed: vendor fix RHSA-2026:66336
  • Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1789479900, rhui5/rhua-rhel9 1790242004, rhui5/haproxy-rhel9 1789479891, rhui5/installer-rhel9 1789482961, rhui5/cds-kubernetes-rhel9 1789479916
    fixed: vendor fix RHSA-2026:67956
show 1 more
  • Red Hat Enterprise Linux AppStream (v. 8) vim-common 8.0.1763-31.el8_10.7, vim-filesystem 8.0.1763-31.el8_10.7 Red Hat Enterprise Linux AppStream (v. 9) vim-common 8.2.2637-26.el9_8.21 Red Hat Enterprise Linux AppStream (v. 10) xxd 9.1.083-9.el10_2.20, vim-common 9.1.083-9.el10_2.20 Red Hat Enterprise Linux BaseOS (v. 8) vim-minimal 8.0.1763-31.el8_10.7 Red Hat Enterprise Linux BaseOS (v. 9) vim-minimal 8.2.2637-26.el9_8.21, vim-filesystem 8.2.2637-26.el9_8.21 Red Hat Enterprise Linux BaseOS (v. 10) vim-data 9.1.083-9.el10_2.20, vim-minimal 9.1.083-9.el10_2.20, vim-filesystem 9.1.083-9.el10_2.20
    +1 more products
    Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1790241954, rhui5/rhua-rhel9 1789478095, rhui5/haproxy-rhel9 1790241900, rhui5/installer-rhel9 1790241922, rhui5/cds-kubernetes-rhel9 1790241897
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
NVD 3.1 4.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

Affected products

  • vim vim

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.