TC-2025-0041 · MCP · MCP

[email protected]

Toxic Agent Flow (Lethal Trifecta): an untrusted public GitHub issue contains a prompt injection that causes the over-scoped GitHub MCP server to read private repositories and publish their contents in a public pull request.

Primary advisory (Invariant Labs (Snyk)) Back to all 66 records

Signed ledger verdict

TC-2025-0041

Known bad (exit 2) mcp:[email protected]

IOC & scope: mcp:[email protected] (Private Repo Exfil via Issue Prompt Injection). Verified by human review and signed into the CC-BY 4.0 OSV v1.6.0 feed.

Credited finder: Invariant Labs (Snyk) ↗
Recorded timestamp: 2025-05-26
Canonical SHA-256: c60cbe735531723d…
Local hook action: Block (exit 2)

Run live in Counter Workbench

Signed in /feed.json (.sig).

01 8-Vector Capability X-Ray (ABOM) & OWASP Agentic Crosswalk

Deterministic capability profile and taxonomy mapping.

Every artifact in the threat.cafe ledger is profiled across eight execution vectors and mapped to the OWASP Top 10 for Agentic Applications (ASI01-ASI10) and Agentic Skills & Tools (AST01-AST10).

8-Vector Capability X-Ray (ABOM)

1. Filesystem
Sensitive paths touched: private_github_repositories
2. Environment
Variables harvested: GITHUB_PERSONAL_ACCESS_TOKEN (repo full scope)
3. Network
Outbound egress domains: api.github.com (public PR/issue creation)
4. Subprocess
Process execution primitives: None observed
5. Lifecycle
Install / startup hooks: None observed
6. OAuth / MCP
Declared scopes: repo, read:org, workflow
7. Obfuscation
Encoding / steganography: None observed
8. Provenance
Attestation status: toxic_agent_flow_composition

Governance & detector mapping

OWASP Agentic ASI (2026): ASI01 (Agent Goal Hijack), ASI02 (Tool Misuse & Exploitation), ASI03 (Identity & Privilege Abuse)
OWASP Agentic AST (2026): AST02 (Tool & Skill Injection), AST07 (Cross-Tool Privilege Escalation)
Deterministic rules matched: CONFIG_06_LETHAL_TRIFECTA

Version scoping & related records

No other versions of this package are currently listed on the board. Unlisted versions evaluate to unknown under local policy.yml.

Local CLI verification

$ threat-cafe-hook check "mcp:[email protected]"
[threat.cafe] known_bad: mcp:[email protected] (TC-2025-0041)
  Reason:  Toxic Agent Flow (Lethal Trifecta): an untrusted public GitHub issue contains a prompt in
  Source: https://invariantlabs.ai/blog/mcp-github-vulnerability (credited to Invariant Labs (Snyk))

OSV v1.6.0 machine-readable record

Included in /feed.json under CC-BY 4.0 license and verified by /feed.json.sig.

{
  "schema_version": "1.6.0",
  "id": "TC-2025-0041",
  "modified": "2025-05-26T14:00:00Z",
  "published": "2025-05-26T14:00:00Z",
  "summary": " Toxic Agent Flow (Lethal Trifecta): an untrusted public GitHub issue contains a prompt injection that causes the over-scoped GitHub MCP server to read private repositories and publish their contents in a public pull request.",
  "affected": [
    {
      "package": {
        "ecosystem": "mcp",
        "name": "github-mcp-lethal-trifecta"
      },
      "versions": [
        "1.0.0"
      ]
    }
  ],
  "credits": [
    {
      "name": "Invariant Labs (Snyk)",
      "type": "FINDER"
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://invariantlabs.ai/blog/mcp-github-vulnerability"
    },
    {
      "type": "WEB",
      "url": "https://threat.cafe/incidents/tc-2025-0041/"
    }
  ],
  "database_specific": {
    "target": "mcp:[email protected]",
    "kind": "mcp",
    "verdict": "known_bad",
    "ioc": "mcp:[email protected] (Private Repo Exfil via Issue Prompt Injection)",
    "artifact_sha256": "c60cbe735531723da1259e6b9292ed6ab731f1c46b3a030c9ac5fc1760945c56",
    "owasp_asi": [
      "ASI01",
      "ASI02",
      "ASI03"
    ],
    "owasp_ast": [
      "AST02",
      "AST07"
    ],
    "rules_matched": [
      "CONFIG_06_LETHAL_TRIFECTA"
    ],
    "abom": {
      "fs_sensitive": [
        "private_github_repositories"
      ],
      "env_harvest": [
        "GITHUB_PERSONAL_ACCESS_TOKEN (repo full scope)"
      ],
      "net_egress": [
        "api.github.com (public PR/issue creation)"
      ],
      "proc_exec": [],
      "install_hooks": [],
      "oauth_scopes": [
        "repo",
        "read:org",
        "workflow"
      ],
      "obfuscation": [],
      "provenance": "toxic_agent_flow_composition"
    },
    "license": "CC-BY-4.0",
    "record_digest": "sha256:52f556a3d424ea7341f3a591099516bdbdb4ab79474b0b1a1776b2cdbdd62423",
    "release_signature_url": "https://threat.cafe/feed.json.sig"
  }
}

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