CVE-2026-4167 Belkin F9K1122 formReboot stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the formReboot function of Belkin F9K1122 routers, potentially leading to code execution or denial of service.
- 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-2026-4167?
CVE-2026-4167 is a high-severity memory corruption vulnerability in Belkin F9K1122, published on 15 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was determined in Belkin F9K1122 1.00.33. This affects the function formReboot of the file /goform/formReboot. This manipulation of the argument webpage causes stack-based buffer overflow. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-4167?
How do I fix CVE-2026-4167?
No fix has been published for CVE-2026-4167 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-2026-4167 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4167 exists.
Sources
Also known as GHSA-26fg-fjwm-xwm6.