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claude-agent-sdk vulnerabilities

Vulnerabilities published for claude-agent-sdk in the last 30 days: 1. Listed in the KEV catalogue: 0.

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Vulnerabilities: 1

  1. CVE-2026-96620

    Critical · CVSS 9.2EPSS 0.7%Fix available

    Claude Agent SDK: Argument Injection via resume Option Allows Arbitrary Command Execution

    Claude Agent SDK is a Python SDK for Claude Code. Prior to 0.2.121, the resume option is passed to the Claude CLI as a separate token without validation, so a dash-leading value is parsed as an independent CLI flag. An attacker can inject the --mcp-config flag to define a stdio MCP server, causing arbitrary command execution at CLI startup outside the SDK permission controls. The issue is exploitable when an application passes untrusted input as the session ID to resume. This issue is fixed in version 0.2.121.

    claude-agent-sdkPython
    • Update to 0.2.121
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

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