What is CVE-2026-6843?

CVE-2026-6843 is a medium-severity vulnerability in Gnu Nano, classified under Use of Externally-Controlled Format String. CVSS score: 5.5/10. Published 2026-04-22.

How severe is CVE-2026-6843?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Gnu Nano

CVE-2026-6843

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 t…

EPSS: 0.000 (5.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Gnu Nano — versions 8.7
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat Openshift Container Platform 4
Redhat Enterprise_linux — versions 6.0, 7.0, 8.0
Redhat Openshift_container_platform — versions 4.0

Weakness classification (CWE)

CWE-134 — Use of Externally-Controlled Format String

References

secalert@redhat.com (x_refsource_REDHAT, Third Party Advisory, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2026-6843?: CVE-2026-6843 is a medium-severity vulnerability in Gnu Nano, classified under Use of Externally-Controlled Format String. CVSS score: 5.5/10. Published 2026-04-22.
How severe is CVE-2026-6843?: Medium severity. CVSS v3 base score is 5.5 out of 10.