CVE-2026-4182 D-Link DIR-816 goahead form2Wl5RepeaterStep2.cgi stack-based overflow

Critical 9.3 Published 15 Mar 2026 Updated 16 Mar 2026

Remote attackers can execute arbitrary code via stack-based buffer overflow in the goahead web server of unsupported D-Link DIR-816 routers.

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

What is CVE-2026-4182?

CVE-2026-4182 is a critical memory corruption vulnerability in Dlink Dir-816 Firmware, published on 15 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A weakness has been identified in D-Link DIR-816 1.10CNB05. This impacts an unknown function of the file /goform/form2Wl5RepeaterStep2.cgi of the component goahead. This manipulation of the argument key1/key2/key3/key4/pskValue causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be used for attacks. This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-121, CWE-787, CWE-119

Which versions are affected by CVE-2026-4182?

It affects 1 product.

Products include Dlink Dir-816 Firmware.

How do I fix CVE-2026-4182?

No fix has been published for CVE-2026-4182 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-2026-4182 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4182 exists.

All Dlink Dir-816 Firmware vulnerabilities

Sources

Also known as GHSA-jmxw-gwqc-xrm5.