CVE-2026-6390: Nano: gnu nano: arbitrary memory writes, information disclosure, or denial of service via format string vulnerability in error handling.
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 Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-6390?
The severity of CVE-2026-6390 is medium with a score of 6.8.
What are the potential impacts of CVE-2026-6390?
CVE-2026-6390 can lead to arbitrary memory writes, information disclosure, or denial of service.
How can I mitigate CVE-2026-6390?
To mitigate CVE-2026-6390, ensure you are using the latest patched version of GNU Nano.
What software is affected by CVE-2026-6390?
CVE-2026-6390 affects the GNU Nano text editor.
How does CVE-2026-6390 exploit the system?
CVE-2026-6390 exploits the system through a format string vulnerability in error handling during multi-buffer operations.