CVE-2026-55887

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Source
https://cve.org/CVERecord?id=CVE-2026-55887
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55887.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55887
Aliases
Downstream
Related
Published
2026-09-15T15:45:36Z
Modified
2026-09-17T03:47:26Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H CVSS Calculator
Summary
MCP Gateway: Argument injection via OCI image label YAML in Docker MCP Gateway
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-88"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55887.json"
}
References

Affected packages

Git / github.com/docker/mcp-gateway

Affected ranges

Type
GIT
Repo
https://github.com/docker/mcp-gateway
Events
Introduced
0c107cb99dc7a456ea4420457289896e7c6e2d0b
Fixed
306d2d94a3b526f43281313321bf784f2d46a7fe
Fixed
439b2200d9e26a4ff414aeb043785df45a78422b
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0.21.0"
        },
        {
            "fixed": "0.42.2"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.21.0
v0.22.0
v0.23.0
v0.24.0
v0.25.0
v0.26.0
v0.27.0
v0.28.0
v0.29.0
v0.30.0
v0.31.0
v0.32.0
v0.33.0
v0.34.0
v0.35.0
v0.36.0
v0.37.0
v0.38.0
v0.39.0
v0.39.2
v0.39.3
v0.40.0
v0.40.1
v0.40.2
v0.40.4
v0.41.0
v0.42.0
v0.42.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55887.json"