CVE-2026-6843 Red Hat CVE debrief

Who should care

Administrators and operators who deploy nano on systems where local users can create or influence directory names should pay attention, especially on shared systems, developer workstations, and environments where nano is used in interactive workflows. Security teams should also review any vendor-specific advisories for the Red Hat products listed in NVD’s affected CPE set.

Technical summary

NVD records the weakness as CWE-134 (format string vulnerability) with CVSS 3.1 vector AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. The published description states that a local user can place printf specifiers in a directory name, which nano then attempts to display through statusline(), leading to a SEGV and denial of service. NVD marks the record as analyzed and cites Red Hat advisory and bug tracker references.

Defensive priority

Medium

Recommended defensive actions

• Review vendor guidance for CVE-2026-6843, including the Red Hat security advisory and related bug tracker entry.
• Update nano to a version that incorporates the vendor fix once available in your distribution or package stream.
• Limit who can create or rename directories on systems where nano is routinely used, especially on shared hosts.
• Treat unexpected nano crashes during directory navigation or statusline rendering as a potential indicator of this issue and investigate affected paths.
• Validate whether any Red Hat products listed in NVD’s affected CPEs are in scope for your environment and apply the relevant vendor remediation guidance.

Evidence notes

This debrief is based only on the supplied CVE/NVD corpus. The CVE description states that a local user can exploit a format string vulnerability in nano’s statusline() function by using a directory name containing printf specifiers, causing a segmentation fault and DoS. NVD lists the record as analyzed, assigns CWE-134, and provides the CVSS vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. NVD also includes official references to a Red Hat advisory and Bugzilla issue tracker entry, plus affected CPEs for nano 8.7 and several Red Hat platform products.

Official resources