CVE-2026-86509 D-Link DIR-895L udhcpcd serverpacket.c sendACK stack-based overflow
A stack-based buffer overflow in the D-Link DIR-895L router's udhcpcd service allows local network attackers to execute arbitrary code or cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86509?
CVE-2026-86509 is a critical memory corruption vulnerability in D-Link DIR-895L, published on 8 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw has been found in D-Link DIR-895L A1_102b07. This impacts the function sendOffer/sendACK of the file udhcpcd/serverpacket.c of the component udhcpcd. This manipulation causes stack-based buffer overflow. The attack can only be done within the local network. The exploit has been published and may be used.
Which versions are affected by CVE-2026-86509?
How do I fix CVE-2026-86509?
No fix has been published for CVE-2026-86509 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-2026-86509 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86509 exists.
Sources
Also known as GHSA-xq27-3vwq-mgr2.