CVE Catalog

CVE-2026-55887

HighCVSS 8.7
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.22%

12th percentile - higher than 12% of all known CVEs

Summary

In Docker MCP Gateway from 0.21.0 until 0.42.2, the attacker-controlled io.docker.server.metadata OCI image label was unmarshalled into the catalog.Server structure for docker:// references and catalog snapshot imports. Runtime-shaping fields including Volumes, User, and ExtraHosts were appended to the docker run arguments without an origin allowlist. A malicious image author can force host filesystem or Docker socket mounts and UID 0 execution.

Risk Assessment

This container-creation-time boundary bypass can execute arbitrary code on the host and is not prevented by no-new-privileges. The risk occurs when a victim selects or pulls a malicious image.

Recommendation

Update Docker MCP Gateway to version 0.42.2. Avoid pulling and running untrusted images.

Related vulnerabilities

Original NVD description (English source)

MCP Gateway allows easy and secure running and deployment of MCP servers. From 0.21.0 until 0.42.2, Docker MCP Gateway YAML-unmarshalled the attacker-controlled io.docker.server.metadata OCI image label into the broad catalog.Server structure for direct docker:// references and catalog snapshot imports in pkg/oci/self_contained.go and pkg/workingset/workingset.go. Runtime-shaping fields including Volumes, User, and ExtraHosts were then appended to the docker run argument vector without an origin allowlist, allowing a malicious image author to request host filesystem or Docker socket mounts and UID 0 execution when a victim selected or pulled the image. This container-creation-time boundary bypass can execute arbitrary code on the host and is not prevented by no-new-privileges because no in-container privilege escalation is required. This issue is fixed in version 0.42.2.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS