{"id":"CVE-2026-102503","state":"PUBLISHED","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.","publishedAt":"2026-10-19T02:20:35.753Z","updatedAt":"2026-10-19T17:46:47.397Z","severity":{"score":9.3,"label":"Critical","version":"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","source":"Google"},"assigner":"Google","products":["Google SAM"],"affected":[{"vendor":"Google","product":"SAM","packageName":"github.com/google/sam","defaultStatus":"unaffected","versions":[{"version":"0.1.0-alpha.1","status":"affected","lessThan":"0.1.0-alpha.3","versionType":"semver"}]}],"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","https://github.com/google/agentmesh/security/advisories/GHSA-r6hp-67wp-c7jx"],"weaknesses":["CWE-306","CWE-862"],"ingestedAt":"2026-10-29T20:10:13.529Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/102xxx/CVE-2026-102503.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-102503","state":"PUBLISHED","datePublished":"2026-10-19T02:20:35.753Z","dateUpdated":"2026-10-19T17:46:47.397Z","assignerShortName":"Google","assignerOrgId":"14ed7db2-1595-443d-9d34-6215bf890778","dateReserved":"2026-09-29T11:07:35.558Z"},"containers":{"cna":{"title":"Missing Authentication on /libp2p-http Ingress in Google OSS Agent Mesh (SAM)","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Google","product":"SAM","packageName":"github.com/google/sam","defaultStatus":"unaffected","versions":[{"version":"0.1.0-alpha.1","status":"affected","lessThan":"0.1.0-alpha.3","versionType":"semver"}]}],"references":[{"url":"https://github.com/google/sam/security/advisories/GHSA-r6hp-67wp-c7jx","tags":["vendor-advisory"]},{"url":"https://github.com/google/sam/commit/433bc99d2a2c10071167bf22acc2c930a12e64e1","tags":["patch"]},{"url":"https://github.com/google/sam/releases/tag/v0.1.0-alpha.3","tags":["release-notes"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"CRITICAL","baseScore":9.3,"vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-306","lang":"en","description":"CWE-306 Missing Authentication for Critical Function","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862 Missing Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"Google","orgId":"14ed7db2-1595-443d-9d34-6215bf890778","dateUpdated":"2026-10-19T02:20:35.753Z"},"datePublic":"2026-09-04T06:09:00.000Z","impacts":[{"capecId":"CAPEC-115","descriptions":[{"lang":"en","value":"CAPEC-115 Authentication Bypass"}]},{"capecId":"CAPEC-180","descriptions":[{"lang":"en","value":"CAPEC-180 Exploiting Incorrectly Configured Access Control Security Levels"}]}],"credits":[{"lang":"en","value":"Yanchon918s","type":"finder"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/google/agentmesh/security/advisories/GHSA-r6hp-67wp-c7jx","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-19T17:46:04.092443Z","id":"CVE-2026-102503","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T17:46:47.397Z"}}]}}}