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Fencer Vulns
high 7.8

CVE-2026-43961 json

Vim: vimscript injection via unescaped filename in netrw s:netrwmarkfile() filter() expression allows arbitrary code execution

published 2026-08-19 2 mo ago modified 2026-11-06 3 d ago also EUVD-2026-62411

cvss
7.8
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 5%
public exploits
0
none known

Summary

A flaw was found in Vim's netrw plugin. A crafted filename containing quote characters and expression fragments can break out of the quoted context during mark/unmark operations, allowing arbitrary Vimscript execution. This can be leveraged to run shell commands with the privileges of the user running Vim.

Patch / fix

  • vim vim 9.2.0480
  • Red Hat Red Hat Hardened Images 9.2.967-1.1.hum1
  • vim Debian 13 2:9.1.1230-2+deb13u1
  • vim Debian 14 2:9.2.0524-1

debian advisories DEBIAN-CVE-2026-43961

  • vim Ubuntu 22.04 LTS 2:8.2.3995-1ubuntu2.31
  • vim Ubuntu 24.04 LTS 2:9.1.0016-1ubuntu7.15
  • vim Ubuntu 25.10 2:9.1.0967-1ubuntu6.6
  • vim Ubuntu 26.04 LTS 2:9.1.2141-1ubuntu4.3
  • vim Ubuntu Pro 14.04 LTS 2:7.4.052-1ubuntu3.1+esm28
  • vim Ubuntu Pro 16.04 LTS 2:7.4.1689-3ubuntu1.5+esm34
  • vim Ubuntu Pro 18.04 LTS 2:8.0.1453-1ubuntu1.13+esm19
  • vim Ubuntu Pro 20.04 LTS 2:8.1.2269-1ubuntu5.32+esm7

ubuntu advisories UBUNTU-CVE-2026-43961

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-2026:57614

  • vim SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 9.2.0530-150000.5.94.1
  • vim Linux Micro Extras 6.2 9.2.0530-160000.1.1

suse advisories SUSE-SU-2026:2313-1SUSE-SU-2026:21833-1

  • vim openSUSE Tumbleweed 9.2.0530-1.1

opensuse advisories openSUSE-SU-2026:11114-1

  • vim Alpine 3.24, Alpine 3.23 9.2.0481-r0

alpine advisories ALPINE-CVE-2026-43961

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

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-2026-43961 updated cvss 7.8

vim: Vimscript injection via unescaped filename in netrw s:NetrwMarkFile() filter() expression allows arbitrary code execution

  • Red Hat Enterprise Linux 6 vim, vim-X11, vim-common, vim-minimal, vim-enhanced, vim-filesystem
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 vim, vim-X11, vim-common, vim-minimal, vim-enhanced, vim-filesystem Red Hat Enterprise Linux 8 vim, vim-X11, vim-common, vim-minimal, vim-enhanced, vim-filesystem Red Hat Enterprise Linux 9 vim, vim-X11, vim-common, vim-minimal, vim-enhanced, vim-filesystem Red Hat Enterprise Linux 10 vim
    affected: workaround, no fix available
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel9
    under investigation
  • 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 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
    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
total
Assessed
2 mo ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • vim vim
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift AI (RHOAI)
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

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.