Claude Code Hooks Security: How Malicious Repos Compromise Developer Machines

Claude Code’s ability to run shell commands, access files, environment variables, and MCP servers can expose developers to supply-chain attacks from malicious repositories, particularly through configuration files that execute before trust confirmation or redirect API traffic. The text highlights CVE-2025-59536, a high-severity remote-code-execution issue involving SessionStart hooks in `.claude/settings.json`, and CVE-2026-21852, which can exfiltrate API keys by modifying `ANTHROPIC_BASE_URL`; both can lead to developer-machine compromise, credential theft, workspace abuse, and unauthorized costs. It describes attack scenarios involving deceptive public repositories, malicious pull requests, and compromised internal accounts, while recommending repository scanning, CI/CD checks, monitoring for suspicious commands and network traffic, managed settings that disable repository hooks, and rapid key rotation after exposure. It presents MintMCP’s MCP Gateway and LLM Proxy as enterprise governance tools for centrally approving MCP servers, enforcing authentication and role-based permissions, blocking risky commands or sensitive-file access, monitoring agent activity, and retaining audit logs for security and compliance. A phased rollout approach begins with a limited pilot, followed by security hardening and organization-wide deployment, with the broader goal of reducing unmanaged “shadow AI” use while preserving approved development workflows.

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