Security audit
nansen-web-fetcher
Security checks for vulnerabilities and agentic risk
Overview
This skill is a narrowly scoped Nansen URL-fetching helper with disclosed API/session use and no bundled executable payload.
Install only if you intend to use Nansen's CLI and are comfortable letting it use your Nansen API key or selected browser session for URL analysis. Review the `nansen-cli` package provenance and avoid passing URLs or questions containing secrets unless that fits your Nansen account's data handling expectations.
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
Vulnerability Patterns
- Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
- Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
- 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
Static analysis
No suspicious patterns detected.