CVE-2026-77148 Comfast CF-N1-S Web Management mbox-config sub_44B50C stack-based overflow

Critical 9.4 Published 20 Aug 2026 Updated 20 Aug 2026

Remote attackers can trigger a stack-based buffer overflow in the web management interface to execute arbitrary code on Comfast CF-N1-S devices.

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-2026-77148?

CVE-2026-77148 is a critical memory corruption vulnerability in Comfast CF-N1-S, published on 20 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability was found in Comfast CF-N1-S 2.6.0.1. This impacts the function sub_44B50C of the file /cgi-bin/mbox-config?method=SET&section=ptest_channel of the component Web Management. The manipulation results in stack-based buffer overflow. The attack can be launched remotely. The exploit has been made public and could be used.

Weakness: CWE-121, CWE-119

Which versions are affected by CVE-2026-77148?

How do I fix CVE-2026-77148?

No fix has been published for CVE-2026-77148 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-2026-77148 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77148 exists.

Sources

Also known as GHSA-j7x2-7p87-73vg.