{"id":"CVE-2026-102503","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.","aliases":["GHSA-r6hp-67wp-c7jx"],"modified":"2026-10-21T02:54:29.361437192Z","published":"2026-10-19T02:20:35.753Z","database_specific":{"cwe_ids":["CWE-306","CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102503.json","cna_assigner":"Google"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102503.json"},{"type":"EVIDENCE","url":"https://github.com/google/agentmesh/security/advisories/GHSA-r6hp-67wp-c7jx"},{"type":"FIX","url":"https://github.com/google/sam/commit/433bc99d2a2c10071167bf22acc2c930a12e64e1"},{"type":"ADVISORY","url":"https://github.com/google/sam/releases/tag/v0.1.0-alpha.3"},{"type":"ADVISORY","url":"https://github.com/google/sam/security/advisories/GHSA-r6hp-67wp-c7jx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102503"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/google/agentmesh","events":[{"introduced":"ffc3e6072383ea6e9cf3fbadc7cf473db448b364"},{"fixed":"866ff9bfd056f8f76ba22c9b45394aef6ce148a1"},{"fixed":"433bc99d2a2c10071167bf22acc2c930a12e64e1"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0.1.0-alpha.1"},{"fixed":"0.1.0-alpha.3"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"range":[{"fixed":"433bc99d2a2c10071167bf22acc2c930a12e64e1"}],"source":"REFERENCES_COMMIT"},{"original_tag":"v0.1.0-alpha.3","range":[{"fixed":"866ff9bfd056f8f76ba22c9b45394aef6ce148a1"}],"source":"REFERENCES_TAG"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102503.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}