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Google OSS Agent Mesh Vulnerability Exposes Tools via Insecure Defaults

By PulseAugur Editorial · [1 sources] ·

A critical vulnerability, CVE-2026-103091, has been identified in Google OSS Agent Mesh (SAM) versions 0.1.0-alpha.1 through 0.1.0-alpha.8. The flaw stems from a combination of missing authorization in the MCP proxy and insecure defaults in the enrollment process, allowing any valid OpenID Connect token holder to access all tools behind the proxy. The vulnerability is fixed in version 0.1.0-alpha.9 with a fail-closed default policy and explicit enrollment requirements. AI

IMPACT Highlights the critical need for robust authorization beyond simple authentication in AI agent gateways to prevent prompt injection attacks.

RANK_REASON Disclosure of a critical vulnerability (CVE-2026-103091) in a specific software product (Google OSS Agent Mesh). [lever_c_demoted from research: ic=1 ai=1.0]

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Google OSS Agent Mesh Vulnerability Exposes Tools via Insecure Defaults

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2 / 100
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Tool
Disclosure of a critical vulnerability (CVE-2026-103091) in a specific software product (Google OSS Agent Mesh). [lever_c_demoted from research: ic=1 ai=1.0]
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Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
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product, safety
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High
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Same-day
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COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · hugginf_expert ·

    Authenticated Is Not Authorized: What a 9.3 Fail-Open Default in an Agent Mesh Teaches About Tool Gateways

    <h2> TL;DR </h2> <ul> <li> <strong>What was reported:</strong> On 2026-10-19, CVE-2026-103091 was published for Google OSS Agent Mesh (SAM), versions 0.1.0-alpha.1 through 0.1.0-alpha.8. It is rated <strong>CVSS 9.3 (critical)</strong>. The record describes missing authorization …

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