Vulnerability · Published Oct 7, 2026 · Assigned by Docker
CVE-2026-92542Blind VXLAN injection into encrypted overlay networks from cluster peer
Medium 6.9
In plain English
A medium-severity authentication bypass by spoofing in Docker Engine from Docker. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 0% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | docker | 29.8.2-r0 | ALPINE-CVE-2026-92542 |
| Debian:12 | docker.io | no fix listed | DEBIAN-CVE-2026-92542 |
| Debian:13 | docker.io | no fix listed | DEBIAN-CVE-2026-92542 |
| Debian:14 | docker.io | no fix listed | DEBIAN-CVE-2026-92542 |
| Ubuntu:26.04:LTS | docker.io | no fix listed | UBUNTU-CVE-2026-92542 |
| Ubuntu:26.10 | docker.io | no fix listed | UBUNTU-CVE-2026-92542 |
| Ubuntu:26.04:LTS | docker.io-app | no fix listed | UBUNTU-CVE-2026-92542 |
| Ubuntu:26.10 | docker.io-app | no fix listed | UBUNTU-CVE-2026-92542 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Docker | Docker Engine | 0 – before 25.0.1926.0.0 – before 29.8.2 |
| Docker | Docker Engine overlay network driver | 0 – before v25.0.19v26.0.0 – before * |
| Moby | Moby overlay network driver | v2.0.0-beta.0 – before v2.0.0-beta.25 |
Weakness: CWE-290 · Vector: 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