CVE-2026-6390 Memory corruption in Red Hat Enterprise Linux 10
A format string vulnerability in GNU nano allows attackers to disclose stack information, crash the application, or potentially execute arbitrary code via crafted filenames.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-6390?
CVE-2026-6390 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 23 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-134
Which versions are affected by CVE-2026-6390?
Linux distribution packages (1)
nano openSUSE:Tumbleweed | All versions | 9.3-1.1 |
How do I fix CVE-2026-6390?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-6390 being exploited?
There is no known exploitation of CVE-2026-6390 in the wild and no public exploit code.
Sources
Also known as AZL-93270, BELL-CVE-2026-6390, DEBIAN-CVE-2026-6390, ECHO-7a9e-a9fb-a110, GHSA-cgrj-mh7v-v4c8, OESA-2026-3810 and 5 more.