CVE-2026-18588 Wavlink WL-NU516U1 nas.cgi fgets stack-based overflow
Remote attackers can execute arbitrary code via a stack-based buffer overflow in the nas.cgi component of Wavlink WL-NU516U1 devices.
- 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-2026-18588?
CVE-2026-18588 is a critical memory corruption vulnerability in Wavlink WL-NU516U1, published on 3 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been found in Wavlink WL-NU516U1 708c073-mt7628. This affects the function fgets of the file nas.cgi. The manipulation of the argument CONTENT_LENGTH leads to stack-based buffer overflow. Remote exploitation of the attack is possible. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Which versions are affected by CVE-2026-18588?
How do I fix CVE-2026-18588?
No fix has been published for CVE-2026-18588 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-2026-18588 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18588 exists.
Sources
Also known as GHSA-hfj9-7vrj-jwv3.