CVE-2026-1686 Totolink A3600R app.so setAppEasyWizardConfig buffer overflow

High 8.7 Published 30 Jan 2026 Updated 23 Feb 2026

Remote attackers can trigger a buffer overflow in the Totolink A3600R router via the setAppEasyWizardConfig function, potentially leading to code execution.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-1686?

CVE-2026-1686 is a high-severity memory corruption vulnerability in Totolink A3600R, published on 30 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A security flaw has been discovered in Totolink A3600R 5.9c.4959. This issue affects the function setAppEasyWizardConfig in the library /lib/cste_modules/app.so. Performing a manipulation of the argument apcliSsid results in buffer overflow. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks.

Weakness: CWE-120, CWE-119

Which versions are affected by CVE-2026-1686?

It affects 1 product.

Products include Totolink A3600r Firmware.

How do I fix CVE-2026-1686?

No fix has been published for CVE-2026-1686 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-2026-1686 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1686 exists.

Sources

Also known as GHSA-2xxq-pq3h-297f.