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Google OSS Agent Mesh (SAM) versions 0.1.0-alpha.1 through 0.1.0-alpha.2 contain missing authentication and authorization checks in the libp2p HTTP ingress implemented by StartIngressServer. Unlike the MCP protocol stream handler, which enforces WithBiscuitAuth and Authorize checks, the parallel HTTP ingress forwards requests directly to registered backend handlers without verifying Biscuit tokens or mesh enrollment. An unauthenticated remote libp2p peer can consequently bypass capability policies and invoke registered services, including command/stdio-backed MCP servers, A2A services, and inference endpoints. The weakness also constitutes missing authorization, classified as CWE-862.
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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.