{"id":"CVE-2026-102503","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-102503","generatedAt":"2026-10-28T02:24:43.198Z","title":"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…","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.","published":"2026-10-19T03:16:58.000Z","lastModified":"2026-10-19T21:13:40.000Z","status":"Awaiting Analysis","sourceIdentifier":"cve-coordination@google.com","cvss":{"version":"4.0","score":9.3,"severity":"CRITICAL","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-306","CWE-862"],"affected":[],"epss":{"score":0.00429,"percentile":0.36945,"date":"2026-10-26","history":[{"date":"2026-10-19","score":0.0034,"percentile":0.26053}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.43%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-19T03:16:58.000Z","detail":{"score":"9.3","severity":"CRITICAL","publishedAt":"2026-10-19T03:16:58.193Z"},"summary":"New CVE, critical severity (CVSS 9.3)."}],"references":[{"url":"https://github.com/google/sam/commit/433bc99d2a2c10071167bf22acc2c930a12e64e1","source":"cve-coordination@google.com"},{"url":"https://github.com/google/sam/releases/tag/v0.1.0-alpha.3","source":"cve-coordination@google.com"},{"url":"https://github.com/google/sam/security/advisories/GHSA-r6hp-67wp-c7jx","source":"cve-coordination@google.com"},{"url":"https://github.com/google/agentmesh/security/advisories/GHSA-r6hp-67wp-c7jx","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-102503","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}