QWED-MCP: Unsafe SymPy `parse_expr()` Remote Code Execution via Unsanitized Math Expression Input
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| QWED-AI | qwed-mcp | affected |
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| Qwed-ai | Qwed-mcp |
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| Source | ID | Title |
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Github GHSA |
GHSA-mw6r-2hvm-4rp2 | qwed-mcp has Unsafe SymPy `parse_expr()` Remote Code Execution via Unsanitized Math Expression Input |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.726% probability within 30 days)
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Qwed-ai
Qwed-ai qwed-mcp |
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| Vendors & Products |
Qwed-ai
Qwed-ai qwed-mcp |
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| Metrics |
ssvc
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| Description | QWED-MCP is a deterministic verification gateway for MCP. Prior to 0.2.1, verify_math_expression() in src/qwed_mcp/engines/math_engine.py passes attacker-controlled expression and claimed_result strings directly to SymPy's parse_expr() after only normalizing caret syntax to Python exponent syntax, without restricting global_dict, removing Python built-ins, or validating the expression AST. Because parse_expr() calls Python's eval() with built-ins available, an attacker who can cause a downstream caller to pass untrusted input to this public library function can use Python import functionality to execute arbitrary operating-system commands as the qwed-mcp process user, read or modify accessible data, exfiltrate process secrets, or reach internal services. The default MCP tool registry does not expose verify_math_expression(), so exploitation requires a downstream integration that invokes the library API with attacker-controlled input. This issue is fixed in version 0.2.1. | |
| Title | QWED-MCP: Unsafe SymPy `parse_expr()` Remote Code Execution via Unsanitized Math Expression Input | |
| Weaknesses | CWE-94 | |
| References |
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| Metrics |
cvssV3_1
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