CVE-2026-6390

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.

Scoring

Severity

MEDIUM

CVSS base score

6.8

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H

EPSS probability

0.15%

CWE

CWE-134

Published

2026-07-23

Last modified

2026-09-01

Weakness type

• CWE-134

Related vulnerabilities

• CVE-2026-69395 — Active Directory Certificate Services (AD CS) Information Disclosure Vulnerability
• CVE-2026-16821 — Vulnerabilities in IBM AIX and PowerVM VIOS
• CVE-2026-81574 — Format String Vulnerability in Logger
• CVE-2026-63073 — Untrusted Sender DN Used as Format String in CMP Response Validation
• CVE-2026-17136 — Vulnerabilities in IBM AIX and PowerVM VIOS
• CVE-2026-68553 — Coturn: Format String Injection via TURN USERNAME/REALM into hiredis Redis Command
• CVE-2026-15961 — Power System Information Disclosure
• CVE-2026-12004 — Security vulnerabilities have been found in IBM Verify Identity Access and IBM Security Verify Access

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