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Security audit

Npm Supply Chain Security

Security checks for vulnerabilities and agentic risk

Overview

This skill is an educational npm supply-chain security guide with purpose-aligned examples and no hidden execution or persistence.

Review the examples before using them in production. The sample trusted-publishing workflow still references an npm token, so adapt it to your registry's current recommended trusted publishing setup and avoid long-lived broad npm tokens.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (1)

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 90)May include surrounding context.

md
return True, "Invalid repository format"
    
    owner, repo = repo_parts
    github_release_url = f"https://api.github.com/repos/{owner}/{repo}/releases/tags/v{version}"
    github_response = requests.get(github_release_url)
    
    if github_response.status_code == 200: