CVE-2026-2856 D-Link DWR-M960 Filter Configuration Endpoint formFilter sub_424AFC stack-based overflow

High 8.7 Published 20 Feb 2026 Updated 24 Feb 2026

Remote attackers can trigger a stack-based buffer overflow in the D-Link DWR-M960 router's filter configuration endpoint to execute arbitrary code.

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-2026-2856?

CVE-2026-2856 is a high-severity memory corruption vulnerability in D-Link DWR-M960, published on 20 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability was found in D-Link DWR-M960 1.01.07. Affected by this vulnerability is the function sub_424AFC of the file /boafrm/formFilter of the component Filter Configuration Endpoint. The manipulation of the argument submit-url results in stack-based buffer overflow. The attack may be launched remotely. The exploit has been made public and could be used.

Weakness: CWE-121, CWE-119

Which versions are affected by CVE-2026-2856?

It affects 1 product.

Products include Dlink Dwr-M960 Firmware.

How do I fix CVE-2026-2856?

No fix has been published for CVE-2026-2856 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-2026-2856 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2856 exists.

Sources

Also known as GHSA-h9gf-cpg2-x9mv.