Format String Vulnerability in Nano Software by Red Hat
CVE-2026-6843

5.5MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
22 April 2026

What is CVE-2026-6843?

A vulnerability exists in the nano text editor that allows a local user to exploit a format string issue within the statusline() function. When a directory name containing printf format specifiers is created, nano attempts to display this name, which can result in a segmentation fault. This behavior creates a Denial of Service (DoS) condition for the nano application, disrupting its normal functionality and user access.

References

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

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Michał Majchrowicz, Marcin Wyczechowski (AFINE Team) for reporting this issue.
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