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Package is self-identified as a dependency-confusion proof-of-concept. Its postinstall hook (src/canary.js) performs a DNS lookup and HTTPS GET to a hardcoded Serveo tunnel host (96e03fa6c292469a-172-245-86-254.serveousercontent.com), sending only the package's own name and version as query parameters. No environment variables, credentials, filesystem contents, or other installer data are read or transmitted; the only signal the operator gains is the installer's public egress IP from the inbound request metadata. README discloses the canary purpose. Concerns: install-time outbound network without opt-out (breaks air-gapped/sandboxed CI), destination is a third-party mutable tunneling endpoint rather than publisher-owned infrastructure, and the canary version coordinate (99.0.0-canary.1) is shaped to win dependency-confusion races against private packages. No credential theft, no code execution of remote content, no persistence.
99.0.0-canary.1Exploitability
AV:NAC:LPR:NUI:NScope
S:CImpact
C:HI:HA:H10.0/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H