CVE-2026-92542

Blind VXLAN injection into encrypted overlay networks from cluster peer

State: Published
Severity: 6.9 Medium
Published: Oct 7, 2026
Updated: Oct 7, 2026
Reserved: Sep 16, 2026

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

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N	Docker

Weaknesses

CWE-290 Authentication Bypass by Spoofing

Affected Products

Product	Versions
Docker EngineDocker	before 25.0.19Affected 26.0.0 to before 29.8.2Affected
Docker Engine overlay network driverDocker	before v25.0.19Affected v26.0.0 and laterAffected
Moby overlay network driverMoby	v2.0.0-beta.0 to before v2.0.0-beta.25Affected

References

https://github.com/moby/moby/security/advisories/GHSA-6m9p-4h64-m6vhvendor-advisory

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