CVE Watch19 oct 2026

CVE-2026-102503

Missing Authentication for Critical Function (CWE-306) and Missing Authorization (CWE-862) in the /libp2p-http ingress server (StartIngressS

CVSS

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Sin CVSS

EPSS

0.3%

p26

KEV

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Exploit Today

0-100

Publicado: 19 oct 2026 · Última mod.: 19 oct 2026 · CWE-306 · CWE-862

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

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.

Referencias oficiales

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