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Security audit

youtube-stable-downloader

Security checks across malware telemetry and agentic risk

Overview

This video-downloader skill is user-directed, but it needs review because its install instructions point to a different ClawHub package and its remote processing/storage is not clearly disclosed.

Install only after confirming that XJouska/u2-downloader is intentionally the same project you meant to review. Avoid submitting private, unlisted, account-linked, or sensitive video URLs unless the publisher clearly explains where URLs and files are processed, how long generated files remain available, and who can access them.

SkillSpector

By NVIDIA
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)

Missing User Warnings

Medium
Confidence
88% confidence
Finding
The skill explicitly documents remote API endpoints for downloading videos and checking account status, but it does not warn users that submitted video URLs and account-related information will be transmitted to an external service and likely logged or processed there. This creates a real transparency and privacy issue because users may assume a local/offline action when the skill actually sends data to third-party infrastructure, including an Alibaba OSS download URL in responses.

VirusTotal

66/66 vendors flagged this skill as clean.

View on VirusTotal

Static analysis

No suspicious patterns detected.