CVE-2026-90680 D-Link DIR-823G HNAP1 SetStaticRouteSettings strcpy stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the HNAP1 interface of D-Link DIR-823G routers, potentially leading to arbitrary code execution.
- 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-2026-90680?
CVE-2026-90680 is a critical memory corruption vulnerability in D-Link DIR-823G, published on 14 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A security flaw has been discovered in D-Link DIR-823G 1.0.2B05_20181207. The impacted element is the function strcpy of the file /HNAP1/SetStaticRouteSettings of the component HNAP1. The manipulation of the argument PAddress/SubnetMask/Gateway results in stack-based buffer overflow. The attack can be launched remotely.
Which versions are affected by CVE-2026-90680?
How do I fix CVE-2026-90680?
No fix has been published for CVE-2026-90680 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-2026-90680 being exploited?
There is no known exploitation of CVE-2026-90680 in the wild and no public exploit code.
Sources
Also known as GHSA-gfg5-84mh-g97c.