CVE-2026-26731 Memory corruption in n/a

High 8.0 Published 17 Feb 2026 Updated 21 Sep 2026

A stack-based buffer overflow in the TOTOLINK A3002RU router allows attackers to execute arbitrary code or cause a denial of service via the routernamer parameter.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-26731?

CVE-2026-26731 is a high-severity memory corruption vulnerability in n/a, published on 17 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

TOTOLINK A3002RU V2.1.1-B20211108.1455 was discovered to contain a stack-based buffer overflow via the routernamer`parameter in the formDnsv6 function.

Weakness: CWE-787, CWE-121

Which versions are affected by CVE-2026-26731?

It affects 1 product.

Products include Totolink A3002ru Firmware.

How do I fix CVE-2026-26731?

No fix has been published for CVE-2026-26731 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-26731 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26731 exists.

Sources

Also known as GHSA-qvhf-98cj-8779.