Vulnerability details
CVE-2026-102503
Missing Authentication on /libp2p-http Ingress in Google OSS Agent Mesh (SAM)
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 4.0 | CVEProject cvelistV5 (CNA) (Google) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| SAM | 0.1.0-alpha.1 ≤ v < 0.1.0-alpha.3 | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://github.com/google/sam/security/advisories/GHSA-r6hp-67wp-c7jx vendor-advisory
- https://github.com/google/sam/commit/433bc99d2a2c10071167bf22acc2c930a12e64e1 patch
- https://github.com/google/sam/releases/tag/v0.1.0-alpha.3 release-notes
- https://github.com/google/agentmesh/security/advisories/GHSA-r6hp-67wp-c7jx exploit
Details
- Published
- 2026-10-19
- Last updated
- 2026-10-19
- State
- Published
- Assigner (CNA)
- Kolun priority
- 39 · Medium
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-306Missing Authentication for Critical Function
- CWE-862Missing Authorization