# CVE-2026-6390

## Summary

- **CVE ID:** CVE-2026-6390
- **Severity:** MEDIUM
- **CVSS Score:** 6.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H)
- **CWE:** CWE-134
- **Published:** Jul 23, 2026
- **Last Modified:** Sep 1, 2026

## 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.

## Affected Products

No affected products listed.

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-6390)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2458767)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.15%
- **EPSS Percentile:** 4.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._