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Fencer Vulns
high 8.2

CVE-2026-52859 json

Vim: Out-of-bounds Read in Terminal Screen Snapshot

published 2026-06-11 4 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-36283

cvss
8.2
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

Vim is an open source, command line text editor. Prior to version 9.2.0565, the update_snapshot() function in src/terminal.c copies the visible terminal screen into the scrollback buffer when a snapshot is taken. For each screen cell it walks the cell's chars[] array with no upper bound, stopping only when it encounters a NUL terminator. When a cell legitimately fills all VTERM_MAX_CHARS_PER_CELL (6) slots — a base character plus five combining marks — the bundled libvterm returns the array without a terminating NUL, so the loop reads past the fixed six-element array and appends the out-of-bounds values to a buffer reserved for only six characters. A program whose output is rendered inside a :terminal window can trigger this with a short byte sequence and no Vim scripting, leading to a crash. This issue has been patched in version 9.2.0565.

Patch / fix

  • vim vim 9.2.0565
  • vim Debian 13 2:9.1.1230-2+deb13u1
  • vim Debian 14 2:9.2.0782-1

debian advisories DEBIAN-CVE-2026-52859

  • vim Ubuntu 22.04 LTS 2:8.2.3995-1ubuntu2.32
  • vim Ubuntu 24.04 LTS 2:9.1.0016-1ubuntu7.16
  • vim Ubuntu 25.10 2:9.1.0967-1ubuntu6.7
  • vim Ubuntu 26.04 LTS 2:9.1.2141-1ubuntu4.5
  • vim Ubuntu Pro 18.04 LTS 2:8.0.1453-1ubuntu1.13+esm20
  • vim Ubuntu Pro 20.04 LTS 2:8.1.2269-1ubuntu5.32+esm8

ubuntu advisories UBUNTU-CVE-2026-52859

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 hummingbird 1 9.2.967-1.1.hum1
  • xxd hummingbird 1 9.2.967-1.1.hum1
  • vim-X11 hummingbird 1 9.2.967-1.1.hum1
  • vim-data hummingbird 1 9.2.967-1.1.hum1
  • vim-common hummingbird 1 9.2.967-1.1.hum1
  • vim-minimal hummingbird 1 9.2.967-1.1.hum1
  • vim-enhanced hummingbird 1 9.2.967-1.1.hum1
  • vim-filesystem hummingbird 1 9.2.967-1.1.hum1

red hat advisories RHSA-2026:57614RHSA-2026:66366RHSA-2026:66348RHSA-2026:66336

  • 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 9.2.0567-r0

alpine advisories ALPINE-CVE-2026-52859

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 9.2.0620-1

azure linux advisories AZL-89772

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-2026-52859 updated cvss 5.0

vim: Vim: Denial of Service via out-of-bounds write in terminal handling

  • 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
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 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
show 3 more
  • Red Hat Hardened Images vim 9.2.967-1.1.hum1, xxd 9.2.967-1.1.hum1, vim-X11 9.2.967-1.1.hum1, vim-data 9.2.967-1.1.hum1, vim-common 9.2.967-1.1.hum1, vim-minimal 9.2.967-1.1.hum1, +3 more
    fixed: vendor fix RHSA-2026:57614
  • 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
  • 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
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

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.