CVE-2026-5044 Belkin F9K1122 Setting formSetSystemSettings stack-based overflow

High 8.7 Published 29 Mar 2026 Updated 30 Mar 2026

Remote attackers can trigger a stack-based buffer overflow in the Belkin F9K1122 router's system settings handler, potentially leading to arbitrary 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-2026-5044?

CVE-2026-5044 is a high-severity memory corruption vulnerability in Belkin F9K1122, published on 29 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A security vulnerability has been detected in Belkin F9K1122 1.00.33. This affects the function formSetSystemSettings of the file /goform/formSetSystemSettings of the component Setting Handler. Such manipulation of the argument webpage leads to stack-based buffer overflow. The attack can be executed remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

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

Which versions are affected by CVE-2026-5044?

It affects 1 product.

Products include Belkin F9k1122 Firmware.

How do I fix CVE-2026-5044?

No fix has been published for CVE-2026-5044 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-2026-5044 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5044 exists.

Sources

Also known as GHSA-jfc9-w27f-487v.