CVE-2026-18607 Wavlink NU516 lighttpd upload.cgi strcpy stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the lighttpd upload.cgi component via the HTTP_COOKIE argument, potentially leading to code execution on Wavlink 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-2026-18607?
CVE-2026-18607 is a high-severity memory corruption vulnerability in Wavlink NU516, published on 3 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A security vulnerability has been detected in Wavlink WN572, WN570H, WN573, WN529, WN530, WN531, WN535, etc. WN529, WN530, WN531, WN535, WN536, WN551, WN557 and NU516 up to 20260609. Affected by this issue is the function strcpy of the file upload.cgi of the component lighttpd. The manipulation of the argument HTTP_COOKIE leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used.
Which versions are affected by CVE-2026-18607?
How do I fix CVE-2026-18607?
No fix has been published for CVE-2026-18607 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-2026-18607 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18607 exists.
Sources
Also known as GHSA-82rw-j2xw-2766.