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3 vulnerabilities found for SAM by Google

CVE-2026-103090 (GCVE-0-2026-103090)
Vulnerability from cvelistv5
Published
2026-10-21 22:16
Modified
2026-10-30 17:26
CWE
  • CWE-306 - Missing Authentication for Critical Function
  • CWE-522 - Insufficiently Protected Credentials
Summary
Missing Authentication for Critical Function (CWE-306) and Insufficiently Protected Credentials (CWE-522) in the control plane enrollment status handler (HandleEnrollStatus at GET /enroll/status in internal/controlplane/server.go) in Google OSS Agent Mesh (SAM) versions 0.1.0-alpha.1 through 0.1.0-alpha.8 allow an unauthenticated remote attacker to retrieve an approved bootstrap-enrolled peer's signed Biscuit identity token by supplying a peer_id obtainable from the unauthenticated GET /info endpoint. A related flaw in POST /enroll allowed any bootstrap-token holder to re-fetch another peer's credential. An attacker can replay the disclosed Biscuit token as a bearer credential on /policies to read mesh authorization policies and on /routers/lease to overwrite advertised router multiaddrs. Users should upgrade to version 0.1.0-alpha.9 or later, which requires cryptographic proof of possession of the enrollment private key on credential-releasing endpoints, enforces rate limiting, and validates router lease addresses.
Impacted products
Vendor Product Version
Google SAM Version: 0.1.0-alpha.1   ≤
Create a notification for this product.
Show details on NVD website


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CVE-2026-103091 (GCVE-0-2026-103091)
Vulnerability from cvelistv5
Published
2026-10-19 02:24
Modified
2026-10-19 17:44
CWE
  • CWE-862 - Missing Authorization
  • CWE-1188 - Initialization of a Resource with an Insecure Default
  • CWE-306 - Missing Authentication for Critical Function
  • CWE-863 - Incorrect Authorization
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Summary
Missing Authorization (CWE-862) and Initialization of a Resource with an Insecure Default (CWE-1188) in the MCP proxy (HandleStreamPassThrough in mcp_service.go) and OIDC registration flow (GET /info and POST /register in internal/controlplane/server.go) in Google OSS Agent Mesh (SAM) versions 0.1.0-alpha.1 through 0.1.0-alpha.8 allow a remote attacker to self-enroll into the mesh and invoke arbitrary tools across all connected MCP backend nodes. Because GET /info publicly discloses OIDC configuration, POST /register auto-enrolls any valid OIDC token holder without claim filtering or ban checks, and the default policy binds sam:system:authenticated to wildcard services and targets, an attacker can obtain a mesh credential with full read, write, and execution access on backend services. Users should upgrade to version 0.1.0-alpha.9 or later, which enforces a fail-closed default policy, explicit policy-binding requirements on enrollment, and ban checks.
Impacted products
Vendor Product Version
Google SAM Version: 0.1.0-alpha.1   ≤
Create a notification for this product.
Show details on NVD website


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CVE-2026-102503 (GCVE-0-2026-102503)
Vulnerability from cvelistv5
Published
2026-10-19 02:20
Modified
2026-10-19 17:46
CWE
  • CWE-306 - Missing Authentication for Critical Function
  • CWE-862 - Missing Authorization
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.
Impacted products
Vendor Product Version
Google SAM Version: 0.1.0-alpha.1   ≤
Create a notification for this product.
Show details on NVD website


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