Claude Code Supply Chain Attacks: Protecting Against Malicious Repository Configs

Claude Code supply chain risks can arise when attackers embed malicious behavior in repository-level `.claude/settings.json` files, which configure automated hooks, MCP server integrations, and environment variables, potentially allowing code execution or API key interception when a repository is opened or cloned. The text highlights CVE-2025-59536, associated with remote code execution through hooks and MCP settings, and CVE-2026-21852, associated with API key exfiltration through a manipulated `ANTHROPIC_BASE_URL`, while noting that patches address those specific flaws but not the broader configuration-file attack surface. It recommends rotating exposed keys, auditing repositories for suspicious settings, requiring review and signed changes for configuration files, applying least-privilege controls to AI agents, isolating credentials, and continuously monitoring commands, file access, network traffic, and MCP tool use. It also argues that enterprises should incorporate AI-specific controls into their secure development lifecycle and compliance programs, and presents centralized gateways and LLM proxies, including MintMCP, as tools for policy enforcement, credential management, monitoring, audit trails, and safer adoption of AI coding assistants.

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