CVE-2026-18589 Wavlink WL-NU516U1 nas.cgi change_password stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the password change function to execute arbitrary code on 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-2026-18589?
CVE-2026-18589 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 was found in Wavlink WL-NU516U1 708c073-mt7628. This impacts the function change_password of the file nas.cgi. The manipulation of the argument User1Passwd results in stack-based buffer overflow. The attack can be executed remotely. The exploit has been made public and could be used. The affected component should be upgraded. 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-2026-18589?
How do I fix CVE-2026-18589?
No fix has been published for CVE-2026-18589 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-2026-18589 being exploited?
There is no known exploitation of CVE-2026-18589 in the wild and no public exploit code.
Sources
Also known as GHSA-jfmw-hm93-c7jh.