Streamlit — the complete, unedited output of the deterministic mcptrustchecker engine v1.9.0, scanned . Every finding, capability tag and score component below is exactly what the engine produced — no AI, no post-processing.
{
"tool": {
"name": "mcptrustchecker",
"version": "1.9.0",
"methodologyVersion": "mcptrustchecker-1.9"
},
"target": {
"id": "streamlit",
"source": {
"kind": "package",
"origin": "streamlit"
},
"server": {
"name": "streamlit"
}
},
"grade": "B",
"score": {
"score": 87,
"threatScore": 94,
"grade": "B",
"band": "B",
"categorySubtotals": {
"injection": 0,
"exfiltration": 0,
"permissions": 6.3,
"supply-chain": 0,
"network": 0,
"hygiene": 0
},
"vector": [
{
"kind": "threat",
"ruleId": "MTC-SRC-007",
"category": "permissions",
"severity": "medium",
"confidence": "strong",
"rawWeight": 9,
"confidenceMult": 0.7,
"diminishingFactor": 1,
"appliedPenalty": 6.3
},
{
"kind": "client",
"term": "capability-exposure",
"level": "high",
"label": "capability blast radius (high) — client exposure if the model is manipulated",
"appliedPenalty": 6
},
{
"kind": "client",
"term": "verification-discount",
"level": "repo",
"label": "publisher verification (public source) — no provenance, but the source is public and inspectable",
"appliedPenalty": 1
},
{
"kind": "client",
"term": "coverage-honesty",
"level": "source",
"label": "inspection depth (source) — how much of the target the scan could see",
"appliedPenalty": 0
}
],
"gatesFired": [],
"methodologyVersion": "mcptrustchecker-1.9"
},
"capability": {
"level": "high",
"reasons": [
"can send data / act on an external service",
"can execute shell commands or code"
],
"tags": [
"code-exec",
"external-sink"
]
},
"coverage": {
"level": "source",
"inputs": {
"toolSurface": false,
"implementationSource": true,
"packageMetadata": true,
"liveTransport": false
},
"caveats": [
"No tools were enumerated, so prompt-injection, capability and toxic-flow analysis had no tool surface to inspect. To grade a package’s real runtime tools, scan the running server: --command \"npx -y <package>\"."
]
},
"findings": [
{
"ruleId": "MTC-SRC-010",
"title": "Dynamic evaluation of a non-literal value (streamlit/static/static/js/StreamlitSyntaxHighlighter.BW47pBZj.js)",
"category": "injection",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`streamlit/static/static/js/StreamlitSyntaxHighlighter.BW47pBZj.js:19`): Evaluating a runtime value as code (rather than a fixed literal) executes whatever reaches it — a direct RCE primitive, and almost never necessary in legitimate code. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "streamlit/static/static/js/StreamlitSyntaxHighlighter.BW47pBZj.js"
},
"evidence": "dowith3?|drop|dropwhile|eval(?:cmd)?|exactp|filter|fix|fixity|flip|float(?:_matrix|_pointer)|floor|fold[lr]1?|frac|free|",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-010",
"file": "streamlit/static/static/js/StreamlitSyntaxHighlighter.BW47pBZj.js",
"line": 19,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-001",
"title": "Dynamic code execution in server code (streamlit/static/static/js/StreamlitSyntaxHighlighter.BW47pBZj.js)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`streamlit/static/static/js/StreamlitSyntaxHighlighter.BW47pBZj.js:17`): Evaluating strings as code is the most direct RCE primitive; if any tool input reaches it, the server executes attacker-chosen code. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "streamlit/static/static/js/StreamlitSyntaxHighlighter.BW47pBZj.js"
},
"evidence": "is.regeneratorRuntime=n:Function(`r`,`regeneratorRuntime = r`)(n)}})),Lr=i(((e,t)=>{function n(e,t,n,r,i,a,o){try{var s=",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-001",
"file": "streamlit/static/static/js/StreamlitSyntaxHighlighter.BW47pBZj.js",
"line": 17,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (streamlit/cli_util.py)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`streamlit/cli_util.py:65`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "streamlit/cli_util.py"
},
"evidence": "# noqa: S404 subprocess.Popen(cmd_line, stdout=devnull, stderr=subprocess.STDOUT) # noqa: S603 def open_br",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "streamlit/cli_util.py",
"line": 65,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (streamlit/navigation/page.py)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`streamlit/navigation/page.py:490`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "streamlit/navigation/page.py"
},
"evidence": "._page) exec(code, module.__dict__) # noqa: S102 return if self._page is n",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "streamlit/navigation/page.py",
"line": 490,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (streamlit/runtime/scriptrunner/script_runner.py)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`streamlit/runtime/scriptrunner/script_runner.py:518`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "streamlit/runtime/scriptrunner/script_runner.py"
},
"evidence": "s while we're inside an exec() call \"\"\" if self._execing: raise RuntimeError(\"Nested set_exe",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "streamlit/runtime/scriptrunner/script_runner.py",
"line": 518,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (streamlit/static/static/js/StreamlitSyntaxHighlighter.BW47pBZj.js)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`streamlit/static/static/js/StreamlitSyntaxHighlighter.BW47pBZj.js:6`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "streamlit/static/static/js/StreamlitSyntaxHighlighter.BW47pBZj.js"
},
"evidence": "e),!0),this.lastIndex=0}exec(e){this.matcherRe.lastIndex=this.lastIndex;let t=this.matcherRe.exec(e);if(!t)return null;l",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "streamlit/static/static/js/StreamlitSyntaxHighlighter.BW47pBZj.js",
"line": 6,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-003",
"title": "Hardcoded egress to an external endpoint (streamlit/runtime/credentials.py)",
"category": "exfiltration",
"severity": "medium",
"confidence": "strong",
"description": "In the server's implementation (`streamlit/runtime/credentials.py:78`): A hardcoded outbound call to a fixed external host inside server code is a classic exfiltration/telemetry channel — especially paired with reads of local data. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "streamlit/runtime/credentials.py"
},
"evidence": "response_json = requests.get( \"https://data.streamlit.io/metrics.json\", timeout=2 ).json()",
"owasp": "LLM02:2025 Sensitive Information Disclosure",
"data": {
"rule": "MTC-SRC-003",
"file": "streamlit/runtime/credentials.py",
"line": 78,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-005",
"title": "Dynamic module load from a non-literal (streamlit/static/static/js/BidiComponent.B_vvnuke.js)",
"category": "permissions",
"severity": "medium",
"confidence": "heuristic",
"description": "In the server's implementation (`streamlit/static/static/js/BidiComponent.B_vvnuke.js:1`): Loading a module chosen at runtime (from a variable) can pull in and run attacker-influenced code paths. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "streamlit/static/static/js/BidiComponent.B_vvnuke.js"
},
"evidence": "l})=>{let u=await d(()=>import(s),[],import.meta.url);if(!u)throw Error(`JS module does not exist.`);if(!u.default||type",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-005",
"file": "streamlit/static/static/js/BidiComponent.B_vvnuke.js",
"line": 1,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-007",
"title": "Unsafe deserialization (streamlit/runtime/caching/cache_data_api.py)",
"category": "permissions",
"severity": "medium",
"confidence": "strong",
"description": "In the server's implementation (`streamlit/runtime/caching/cache_data_api.py:747`): Deserializing untrusted data with these APIs can execute arbitrary code (a well-known RCE gadget class). This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "streamlit/runtime/caching/cache_data_api.py"
},
"evidence": "ry: entry = pickle.loads(pickled_entry) # noqa: S301 if not isinstance(entry, CachedResult):",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-007",
"file": "streamlit/runtime/caching/cache_data_api.py",
"line": 747,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in packaging/dev tooling (streamlit/.agents/meta-skill/developing-with-streamlit/scripts/discover.py)",
"category": "permissions",
"severity": "low",
"confidence": "heuristic",
"description": "In a packaging/dev/install script (shipped, but not the server runtime) (`streamlit/.agents/meta-skill/developing-with-streamlit/scripts/discover.py:207`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "streamlit/.agents/meta-skill/developing-with-streamlit/scripts/discover.py"
},
"evidence": "try: result = subprocess.run( # noqa: S603 - cmd is a detected interpreter path, not user input.",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "streamlit/.agents/meta-skill/developing-with-streamlit/scripts/discover.py",
"line": 207,
"nonRuntime": true
}
},
{
"ruleId": "MTC-SUP-012",
"title": "Package has no license",
"category": "hygiene",
"severity": "info",
"confidence": "strong",
"description": "\"streamlit\" has no declared license. This is a legal/reuse concern, not a security finding.",
"location": {
"kind": "package",
"name": "streamlit"
}
}
],
"toxicFlows": [],
"capabilities": [],
"surfaceDigest": "03798346aa5158dc4833ab0ab6c9628452dba32394421d197d2e868adb8fa4c8",
"stats": {
"tools": 0,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 6,
"medium": 3,
"low": 1,
"info": 1
}
}
}