CVE-2026-2566 Wavlink WL-NU516U1 adm.cgi sub_406194 stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the Wavlink WL-NU516U1 router's adm.cgi script to execute arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-2566?
CVE-2026-2566 is a high-severity memory corruption vulnerability in Wavlink WL-NU516U1, published on 16 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A security vulnerability has been detected in Wavlink WL-NU516U1 up to 130/260. This affects the function sub_406194 of the file /cgi-bin/adm.cgi. Such manipulation of the argument firmware_url leads to stack-based buffer overflow. The attack can be launched 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.
Which versions are affected by CVE-2026-2566?
How do I fix CVE-2026-2566?
No fix has been published for CVE-2026-2566 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-2026-2566 being exploited?
There is no known exploitation of CVE-2026-2566 in the wild and no public exploit code.
Sources
Also known as GHSA-jxpj-x8cw-h5ph.