Use of Externally-Controlled Format String Affecting rhcos package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.02% (5th percentile)

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  • Snyk IDSNYK-RHEL9-RHCOS-16122389
  • published22 Apr 2026
  • disclosed13 Apr 2026

Introduced: 13 Apr 2026

CVE-2026-6843  (opens in a new tab)
CWE-134  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:9 rhcos.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rhcos package and not the rhcos package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1