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Vulnerabilities CVE-2026-6390

CVE-2026-6390

Medium
Open
TLP:CLEAR

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

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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.

Details

CVSS Score
6.8
EPSS Score
0.11%

1.3th percentile

CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H
Confidence
90%
Published
Jul 23, 2026
Last Modified
Aug 21, 2026
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