CVE-2026-91001 D-Link DI-8400 DDNS Configuration ddns.asp ddns_asp stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the DDNS configuration interface of D-Link DI-8400 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-2026-91001?
CVE-2026-91001 is a critical memory corruption vulnerability in D-Link DI-8400, published on 15 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 DI-8400 16.07. This affects the function ddns_asp of the file /ddns.asp of the component DDNS Configuration. Performing a manipulation of the argument serv/user/host/wild/mx/bmx/cust/ip results in stack-based buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.
Which versions are affected by CVE-2026-91001?
How do I fix CVE-2026-91001?
No fix has been published for CVE-2026-91001 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-2026-91001 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91001 exists.
Sources
Also known as GHSA-gqwf-9wg7-q94q.