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CVE-2026-6843: Nano: nano: format string vulnerability leads to denial of service

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-22 · updated 2026-10-26
• Weakness: CWE-134

Description

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.

Affected products

• GNU Nano: 8.7
• Red Hat Enterprise Linux: 6.0, 7.0, 8.0, 9.0, 10.0
• Red Hat OpenShift Container Platform 4.18: 4.0

References

• https://access.redhat.com/security/cve/CVE-2026-6843
• https://bugzilla.redhat.com/show_bug.cgi?id=2460017

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