CVE-2026-92542 Blind VXLAN injection into encrypted overlay networks from cluster peer
Attackers can inject blind VXLAN traffic into encrypted Docker Swarm overlay networks, bypassing IPsec encryption protections.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-92542?
CVE-2026-92542 is a medium-severity vulnerability in Docker Engine, published on 7 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The firewall rules which mark VXLAN datagrams for encryption indiscriminately match both authentic VXLAN datagrams sent from the kernel and forged datagrams sent by user processes. Any packet sent from the host network namespace of a Linux Swarm node is encrypted with the overlay-network IPsec parameters which meets the following criteria:
- UDP datagram - Destination port is the Swarm data-path port - Datagram starts with a VXLAN header for the VNI of an encrypted overlay network which any running container on the node is connected to
Weakness: CWE-290
Which versions are affected by CVE-2026-92542?
How do I fix CVE-2026-92542?
Apply the vendor's patch.
Is CVE-2026-92542 being exploited?
There is no known exploitation of CVE-2026-92542 in the wild and no public exploit code.
Sources
Also known as AZL-107739, BELL-CVE-2026-92542, DEBIAN-CVE-2026-92542, ECHO-a2cc-0616-7d9c, GHSA-6m9p-4h64-m6vh, UBUNTU-CVE-2026-92542.