CVE-2026-102503 (GCVE-0-2026-102503)

Vulnerability from cvelistv5 – Published: 2026-10-19 02:20 – Updated: 2026-10-19 17:46
VLAI
Title
Missing Authentication on /libp2p-http Ingress in Google OSS Agent Mesh (SAM)
Summary
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.
Severity
9.3 (Critical)
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
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-19 17:46 UTC
CWE
  • CWE-306 - Missing Authentication for Critical Function
  • CWE-862 - Missing Authorization
Assigner
Google CNA under the Google root
CNA scorecard B 76/100 over 35 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Google SAM Affected: 0.1.0-alpha.1 , < 0.1.0-alpha.3 (semver)
guessed Create a notification for this product.
Date Public
2026-09-04 06:09
Credits
Yanchon918s
Show details on NVD website
To clipboard 

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