{"id":"CVE-2026-55887","revision":null,"records":[{"revision":"4111215f494146ff9469a3f322ca19a2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-55887","aliases":[],"title":"MCP Gateway: Argument injection via OCI image label YAML in Docker MCP Gateway","description":"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.","state":0,"publishedAt":"2026-09-15T15:45:36.42+00:00","modifiedAt":"2026-09-15T18:02:09.186+00:00","affected":[{"ecosystem":"Vendor product","name":"mcp-gateway","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"docker\",\n                    \"product\": \"mcp-gateway\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 0.21.0, < 0.42.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":8.7,"severity":"HIGH"}],"references":["https://github.com/docker/mcp-gateway/security/advisories/GHSA-r2xf-7jw5-pjg6","https://github.com/docker/mcp-gateway/pull/498","https://github.com/docker/mcp-gateway/commit/306d2d94a3b526f43281313321bf784f2d46a7fe","https://github.com/docker/mcp-gateway/commit/439b2200d9e26a4ff414aeb043785df45a78422b","https://github.com/docker/mcp-gateway/releases/tag/v0.42.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55887","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-55887","identifiers":["CVE-2026-55887"]},"retained":false,"historicalAffected":[]},{"revision":"ec9c8c98a11948d1ac4dc864387af505","observedAt":"2026-11-11T14:05:12.141+00:00","statement":{"source":"euvd","id":"EUVD-2026-78684","aliases":["CVE-2026-55887","GHSA-r2xf-7jw5-pjg6"],"title":"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 structu…","description":"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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"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","score":8.7,"severity":null}],"references":["https://github.com/docker/mcp-gateway/security/advisories/GHSA-r2xf-7jw5-pjg6","https://github.com/docker/mcp-gateway/pull/498","https://github.com/docker/mcp-gateway/commit/306d2d94a3b526f43281313321bf784f2d46a7fe","https://github.com/docker/mcp-gateway/commit/439b2200d9e26a4ff414aeb043785df45a78422b","https://github.com/docker/mcp-gateway/releases/tag/v0.42.2"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-78684","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 15, 2026, 3:45:36 PM","dateUpdated":"Sep 15, 2026, 6:02:09 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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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.","state":0,"publishedAt":"2026-09-15T16:17:16.667+00:00","modifiedAt":"2026-09-30T17:51:56.193+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":8.7,"severity":"HIGH"}],"references":["https://github.com/docker/mcp-gateway/commit/306d2d94a3b526f43281313321bf784f2d46a7fe","https://github.com/docker/mcp-gateway/commit/439b2200d9e26a4ff414aeb043785df45a78422b","https://github.com/docker/mcp-gateway/pull/498","https://github.com/docker/mcp-gateway/releases/tag/v0.42.2","https://github.com/docker/mcp-gateway/security/advisories/GHSA-r2xf-7jw5-pjg6"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55887","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-88"],"productCriteria":[],"sourceDates":{"published":"2026-09-15T16:17:16.667","lastModified":"2026-09-30T17:51:56.193"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-55887","identifiers":["CVE-2026-55887"]},"retained":false,"historicalAffected":[]},{"revision":"52c75815ce6a453e8a70bd41919eb391","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-r2xf-7jw5-pjg6","aliases":["CVE-2026-55887","GO-2026-5604"],"title":"Docker MCP Gateway: Argument injection via OCI image label YAML","description":"## Summary\n\nA maliciously crafted OCI image label can inject arbitrary arguments into the `docker run` command line constructed by the MCP Gateway. An attacker who controls an image that the victim references via `docker://`, or that the victim's catalog pulls a snapshot from, can mount the host filesystem, run as UID 0, and execute arbitrary code on the host.\n  \n## Details\n\n The `io.docker.server.metadata` OCI image label is YAML-unmarshalled directly into the wide `catalog.Server` struct, which carries runtime-shaping fields (`Volumes`, `User`, `Command`, `ExtraHosts`, `AllowHosts`, `DisableNetwork`, `Env`, `Remote`, `SSEEndpoint`, `OAuth`,`Secrets`, `LongLived`, `Policy`) alongside descriptive fields. Every runtime field carries a YAML tag, so the unmarshal mass-assigns from the attacker-controlled label content; only `Image` is overwritten afterwards. The gateway's container-launch code then appends those fields verbatim as `docker run` flags (`-v`, `-u`, `--add-host`) with no allowlist or origin check, and execs `docker` with the resulting argv.\n\n## Impact\n  \nA malicious image author can achieve arbitrary code execution as UID 0 on the host of a victim running an affected version of MCP Gateway. Attacker-injected `-v /:/host`, `-u root`, and `-v /var/run/docker.sock:/var/run/docker.sock` arguments reach the `docker run` invocation that launches the MCP server container, giving the attacker full host filesystem access and root execution. The container/host trust boundary is bypassed at container-creation time, so the `--security-opt no-new-privileges` flag the gateway applies provides no protection: no in-container privilege escalation is needed.\n\n## Patches\nThe OCI image-label parser now only populates descriptive fields from the image label, which excludes fields that control the container runtime.\n\n## Credit\n\nThis issue was reported by Jabr Al-Otaibi `@ DarkCov` working with TrendAI Zero Day Initiative","state":0,"publishedAt":"2026-06-18T13:05:06+00:00","modifiedAt":"2026-06-25T23:11:30.2593156+00:00","affected":[{"ecosystem":"Go","name":"github.com/docker/mcp-gateway","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.21.0"},{"kind":"fixed","version":"0.42.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/docker/mcp-gateway/security/advisories/GHSA-r2xf-7jw5-pjg6","https://github.com/docker/mcp-gateway"],"sourceUrl":"https://github.com/advisories/GHSA-r2xf-7jw5-pjg6","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-r2xf-7jw5-pjg6","identifiers":["GHSA-r2xf-7jw5-pjg6","CVE-2026-55887","GO-2026-5604"]},"retained":false,"historicalAffected":[]},{"revision":"b9c0da8c15084c99bbb7147e4adaa033","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5604","aliases":["CVE-2026-55887","GHSA-r2xf-7jw5-pjg6"],"title":"Docker MCP Gateway: Argument injection via OCI image label YAML in github.com/docker/mcp-gateway","description":"Docker MCP Gateway: Argument injection via OCI image label YAML in github.com/docker/mcp-gateway","state":0,"publishedAt":"2026-06-25T22:34:34+00:00","modifiedAt":"2026-06-25T23:01:35.5935833+00:00","affected":[{"ecosystem":"Go","name":"github.com/docker/mcp-gateway","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.21.0"},{"kind":"fixed","version":"0.42.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/docker/mcp-gateway/security/advisories/GHSA-r2xf-7jw5-pjg6"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5604","license":"OSV · upstream source license applies","key":"osv:GO-2026-5604","identifiers":["GO-2026-5604","CVE-2026-55887","GHSA-r2xf-7jw5-pjg6"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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