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Fencer Vulns
medium 5.5

CVE-2026-6843 json

Nano: nano: format string vulnerability leads to denial of service

published 2026-04-22 6 mo ago modified 2026-11-05 3 d ago also EUVD-2026-24708

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

A flaw was found in nano. A local user could exploit a format string vulnerability in the `statusline()` function. By creating a directory with a name containing `printf` specifiers, the application attempts to display this name, leading to a segmentation fault (SEGV). This results in a Denial of Service (DoS) for the `nano` application.

Patch / fix

  • nano Debian 13 8.4-1+deb13u1
  • nano Debian 14 9.0-1

debian advisories DEBIAN-CVE-2026-6843

  • nano Ubuntu 22.04 LTS 6.2-1ubuntu0.2
  • nano Ubuntu 24.04 LTS 7.2-2ubuntu0.2
  • nano Ubuntu 25.10 8.4-1ubuntu0.1
  • nano Ubuntu 26.04 LTS 8.7.1-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2026-6843

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

  • nano openSUSE Leap 16.0 9.1-bp160.1.1
  • nano openSUSE Tumbleweed 9.0-2.1

opensuse advisories openSUSE-SU-2026:21166-1openSUSE-SU-2026:10851-1

  • nano Azure Linux 3.0 6.4-3

azure linux advisories AZL-85560

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-2026-6843 updated cvss 5.5

nano: nano: Format string vulnerability leads to Denial of Service

  • Red Hat Enterprise Linux 6 nano Red Hat Enterprise Linux 7 nano Red Hat Enterprise Linux 8 nano Red Hat Enterprise Linux 9 nano Red Hat Enterprise Linux 10 nano 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 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
6 mo ago

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

  • 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 Container Platform 4

Classification

Weakness
  • CWE-134 Use of Externally-Controlled Format String

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.