Use of Externally-Controlled Format String Affecting nano package, versions <9.0-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.15% (5th percentile)

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  • Snyk IDSNYK-DEBIAN14-NANO-18274504
  • published23 Jul 2026
  • disclosed23 Jul 2026

Introduced: 23 Jul 2026

CVE-2026-6390  (opens in a new tab)
CWE-134  (opens in a new tab)

How to fix?

Upgrade Debian:14 nano to version 9.0-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nano package and not the nano package as distributed by Debian. See How to fix? for Debian:14 relevant fixed versions and status.

A flaw was found in GNU nano's multi-buffer error message handling. When a user opens multiple files at startup and one triggers an ALERT-level error, a specially crafted filename containing printf format specifiers can be reinterpreted. This format string vulnerability may allow an attacker to achieve stack information disclosure, cause a denial of service (crash), or potentially perform arbitrary memory writes.

CVSS Base Scores

version 3.1