CVE-2026-6390 – Nano: gnu nano: arbitrary memory writes, information disclosure, or denial of service via format string vulnerability in error handling.

CVE ID :CVE-2026-6390

Published : July 23, 2026, 5:16 a.m. | 30 minutes ago

Description :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.

Severity: 6.8 | MEDIUM

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