{"id":"CVE-2026-102503","revision":"c7334430bf8a4831a44a939edf371979","records":[{"revision":"c7334430bf8a4831a44a939edf371979","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-102503","aliases":[],"title":"Missing Authentication on /libp2p-http Ingress in Google OSS Agent Mesh (SAM)","description":"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.","state":0,"publishedAt":"2026-10-19T02:20:35.753+00:00","modifiedAt":"2026-10-19T17:46:47.397+00:00","affected":[{"ecosystem":"Vendor product","name":"github.com/google/sam","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Google\",\n                    \"product\": \"SAM\",\n                    \"packageName\": \"github.com/google/sam\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0.1.0-alpha.1\",\n                            \"lessThan\": \"0.1.0-alpha.3\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":9.3,"severity":"CRITICAL"}],"references":["https://github.com/google/sam/security/advisories/GHSA-r6hp-67wp-c7jx","https://github.com/google/sam/commit/433bc99d2a2c10071167bf22acc2c930a12e64e1","https://github.com/google/sam/releases/tag/v0.1.0-alpha.3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-102503","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-102503","identifiers":["CVE-2026-102503"]},"retained":false,"historicalAffected":[]}],"coverage":[]}