GCVE-110-OSM-2026-13429

Advisory PublishedCVSS 9.6/10

Vulnetix · Advisory published October 10, 2026

Malicious package detected. Behaviors: data exfiltration, install-time execution. ENTRY postinstall.js (install-hook: node ./postinstall.js) - Install Hook Executes Local JS File in package.json DESTINATION - 2 exfil (custom-c2) (values recorded in verified_iocs) EXFIL - Network Request in postinstall.js: "https.request(" - System Information Collection in postinstall.js: "os.userInfo()" - DNS Lookup in postinstall.js: "dns.lookup(" ADDITIONAL FINDINGS - Publisher Has Other Malicious Packages - Brand New Package - Very New NPM Publisher Account - Publisher Shows Burner-Account Pattern - Rapid Version Publishing PAYLOAD FILES postinstall.js

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Weaknesses (CWE)

CWE-506Embedded Malicious Code

Risk Scores

CVSS 3.1

9.6/10

Critical · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected Products

Vendor	Product	Versions	Platforms
unknown	@s4yhiitestpoc/r3-https	all (affected)	—

References

Malicious npm package: @s4yhiitestpoc/r3-https

advisory

vendor

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