{"schema":"threatline.record/2","record":{"id":"CVE-2026-102503","aliases":["GHSA-r6hp-67wp-c7jx"],"summary":"Missing Authentication on /libp2p-http Ingress in Google OSS Agent Mesh (SAM)","details":"Missing Authentication for Critical Function (CWE-306) and Missing Authorization (CWE-862) in the /libp2p-http ingress server (StartIngressServer in cmd/sam-node/node.go) in Google OSS Agent Mesh (SAM) versions 0.1.0-alpha.1 through 0.1.0-alpha.2 allow an unauthenticated remote libp2p peer to bypass Biscuit capability policy enforcement and invoke arbitrary registered backend services (including command/stdio-backed MCP servers, A2A, and inference endpoints). While the MCP protocol stream handler enforces WithBiscuitAuth and Authorize checks, the parallel /libp2p-http ingress routes requests directly to backend service handlers without verifying a Biscuit token or mesh enrollment. Users should upgrade to version 0.1.0-alpha.3 or later.","categories":["Unclassified"],"product":"SAM","vendor":"Google","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-102503","source_modified_at":"2026-10-19T17:46:47.397Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"SAM","vendor":"Google","versions":[{"status":"affected","version":"0.1.0-alpha.1","lessThan":"0.1.0-alpha.3","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-102503","source_modified_at":"2026-10-19T17:46:47.397Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"SAM","ecosystem":null},"version":"0.1.0-alpha.3","basis":"first unaffected version stated in the CVE record"}],"cvss":9.3,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00348,"percentile":0.27199,"score_date":"2026-10-23"},"published_at":"2026-10-19T02:20:35.753Z","modified_at":"2026-10-19T17:46:47.397Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-102503","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T17:46:47.397Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-102503","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/google/sam/security/advisories/GHSA-r6hp-67wp-c7jx","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://github.com/google/sam/commit/433bc99d2a2c10071167bf22acc2c930a12e64e1","tags":["patch"]},{"source":"CVE List","url":"https://github.com/google/sam/releases/tag/v0.1.0-alpha.3","tags":["release-notes"]},{"source":"CVE List","url":"https://github.com/google/agentmesh/security/advisories/GHSA-r6hp-67wp-c7jx","tags":["exploit"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"yes","technical_impact":"total","assessed_at":"2026-10-19T17:46:04.092443Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-19T17:46:47.397Z","content_hash":"907898b2ebd5675a2708e1a139d1a340741aa9299cfcb6c7a45acea613bd8932"}}