CVE-2026-7546 Totolink NR1800X lighttpd find_host_ip stack-based overflow
A remote attacker can trigger a stack-based buffer overflow in the lighttpd component of Totolink NR1800X routers via the Host header, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-7546?
CVE-2026-7546 is a critical memory corruption vulnerability in Totolink NR1800X, published on 1 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security vulnerability has been detected in Totolink NR1800X 9.1.0u.6279_B20210910. The impacted element is the function find_host_ip of the component lighttpd. Such manipulation of the argument Host leads to stack-based buffer overflow. The attack can be executed remotely. The exploit has been disclosed publicly and may be used.
Which versions are affected by CVE-2026-7546?
How do I fix CVE-2026-7546?
No fix has been published for CVE-2026-7546 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-2026-7546 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7546 exists.
Sources
Also known as GHSA-jhgg-p4c8-m4gr.