CVE-2026-5043 Belkin F9K1122 Parameter formSetPassword stack-based overflow

High 8.7 Published 29 Mar 2026 Updated 30 Mar 2026

Remote attackers can exploit a stack-based buffer overflow in the password setting function to execute arbitrary code on Belkin F9K1122 routers.

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-2026-5043?

CVE-2026-5043 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 weakness has been identified in Belkin F9K1122 1.00.33. The impacted element is the function formSetPassword of the file /goform/formSetPassword of the component Parameter Handler. This manipulation of the argument webpage 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. 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-2026-5043?

It affects 1 product.

Products include Belkin F9k1122 Firmware.

How do I fix CVE-2026-5043?

No fix has been published for CVE-2026-5043 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-2026-5043 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5043 exists.

Sources

Also known as GHSA-h95j-mxr9-q69c.