Veille CVE

‹ Retour à la liste

CVE-2026-55546

9.8 Critique

Publiée le 25/08/2026 à 18:16 · Modifiée le 09/09/2026 à 23:07 · Analyse NVD reportée · Source : security-advisories@github.com

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.

Traduire en français

Produits concernés

Scores CVSS

VersionScoreSourceVecteur
3.1 9.8 Critique security-advisories@github.com CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Faiblesses (CWE)

Références

Ailleurs