CVE-2026-102503

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

No CVSS.

References

Link	Resource
https://github.com/google/sam/commit/433bc99d2a2c10071167bf22acc2c930a12e64e1
https://github.com/google/sam/releases/tag/v0.1.0-alpha.3
https://github.com/google/sam/security/advisories/GHSA-r6hp-67wp-c7jx
https://github.com/google/agentmesh/security/advisories/GHSA-r6hp-67wp-c7jx

Configurations

No configuration.

History

19 Oct 2026, 18:16

Type	Values Removed	Values Added
References		() https://github.com/google/agentmesh/security/advisories/GHSA-r6hp-67wp-c7jx -

19 Oct 2026, 03:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-19 03:16

Updated : 2026-10-19 21:13

NVD link : CVE-2026-102503

Mitre link : CVE-2026-102503

CVE.ORG link : CVE-2026-102503

JSON object : View

Products Affected

No product.

CWE

CWE-306

Missing Authentication for Critical Function

CWE-862

Missing Authorization

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