CVE-2026-92542: Vulnerability in Docker Docker Engine
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
CVSS v4.0
Score 6.9medium
Affected software
Docker
Docker Engine
Docker
Docker Engine overlay network driver
Moby
Moby overlay network driver
pkg:github/github.com/docker/docker/libnetwork/drivers/overlaypkg:github/github.com/moby/moby/v2/daemon/libnetwork/drivers/overlayRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Docker Engine involves firewall rules that indiscriminately mark VXLAN datagrams for encryption. Both authentic VXLAN datagrams sent from the kernel and forged datagrams sent by user processes are matched. Specifically, any UDP datagram sent from the host network namespace of a Linux Swarm node is encrypted if it is destined for the Swarm data-path port and starts with a VXLAN header for the VNI of an encrypted overlay network connected to any running container on the node. This behavior may lead to unintended encryption of forged packets.
Potential Impact
The impact is that user processes can cause packets to be encrypted with overlay-network IPsec parameters, which may lead to misuse or bypass of intended network protections. The CVSS score of 6.9 (medium severity) reflects that the vulnerability requires local privileges and does not allow user interaction but has high impact on integrity and availability.
Mitigation Recommendations
No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the Docker vendor advisory for current remediation guidance. Until a fix is available, consider restricting local user privileges and monitoring for unusual network activity related to VXLAN datagrams.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Docker
- Date Reserved
- 2026-09-16T13:00:30.172Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ac678232cdf04f65666407d
Added to database: 10/07/2026, 16:49:39 UTC
Last enriched: 10/07/2026, 17:04:11 UTC
Last updated: 10/07/2026, 20:48:59 UTC
Views: 14
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