GCVE-110-OSM-2026-4616

Advisory PublishedCVSS 9.6/10

Vulnetix · Advisory published May 22, 2026

[osmalyze-auto] Malicious package detected. Behaviors: data exfiltration, network activity, obfuscated code, install-time execution. [osmalyze-auto] Entrypoint: src/postinstall.js (install-hook: node src/postinstall.js) Exfil: https://rpc.ankr.com/eth (custom-c2, recovery: plaintext in src/benchmark.js) Payload: src/postinstall.js Key findings: - Decoded Base64 Content in src/postinstall.js - Decoded Base64 Content in src/postinstall.js - Install Hook Executes Local JS File in package.json: ""postinstall": "node src/postinstall.js"" - Dynamic Base64 Decoding in src/postinstall.js: "Buffer.from(s,'base64')" - Brand New Package IOCs: - ipv4: 165.22.200.211 - urls: http://165.22.200.211:8545, http://165.22.200.211:8080, http://165.22.200.211:8545`, http://165.22.200.211:8080/spectre_log.json`, https://rpc.ankr.com/eth (+4 more) - domains: rpc.ankr.com, cloudflare-eth.com, ethereum.publicnode.com, eth.llamarpc.com - emails: dev@shieldlabs.io - ethereumAddresses: 0x85085E00bf71c5f0cd1c7620752161f53d061E19 - ips: 165.22.200.211 - payloadFileHash: 2815ae1de675a6e5130271543cc9b2c0a22a300ac52070aec2e559d138de6db8 Decoded/deobfuscated IOCs: - urls: http://165.22.200.211:8545 - ips: 165.22.200.211

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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	mev-shield	1.4.2 (affected)	—

References

Malicious npm package: mev-shield

advisory

vendor

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