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CVE-2025-9141

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Date: September 4, 2025

Summary An unsafe deserialization vulnerability allows any authenticated user to execute arbitrary code on the server if they are able to get the model to pass the code as an argument to a tool call. Details vLLM's "Qwen3 Coder tool parser" (https://github.com/vllm-project/vllm/blob/main/vllm/entrypoints/openai/tool_parsers/qwen3coder_tool_parser.py) contains a code execution path that uses Python's "eval()" function to parse tool call parameters. This occurs during the parameter conversion process when the parser attempts to handle unknown data types. This code path is reached when: 1. Tool calling is enabled ("--enable-auto-tool-choice") 2. The qwen3_coder parser is specified ("--tool-call-parser qwen3_coder") 3. The parameter type is not explicitly defined or recognized Impact Remote Code Execution via Python's "eval()" function.

Severity Score

Severity Score

Weakness Type (CWE)

Deserialization of Untrusted Data

CWE-502

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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