GCVE-110-OSM-2026-4077

Advisory PublishedCVSS 9.6/10

Vulnetix · Advisory published May 11, 2026

[osmalyze-auto] Malicious package detected. Behaviors: data exfiltration, code execution, obfuscated code, install-time execution. [osmalyze-auto] Entrypoint: setup.mjs (install-hook: node setup.mjs) Exfil: http://filev2.getsession.org/file/ (custom-c2, recovery: plaintext in router_init.js) Payload: router_init.js Key findings: - Download Execute Delete Pattern in build/cmux-mcp.js: "execFileSync, execSync } from 'node:child_process'; import { existsSync, mkdirSy..." - Environment Variable Exfiltration in router_init.js: "process.env,_0x19c3dc=await _0x41cd85[_0x24a951(0x1e27)](fetch" - Download Execute Delete Pattern in setup.mjs: "writeFileSync(dt, fd); } function xb(zp, en, od) { if (hc("unzip", ["-v"])) {..." - Shell Command Execution in build/cmux-mcp.js: "execSync(" - Shell Command Execution in build/init.js: "execSync(" IOCs: - urls: https://polyformproject.org/licenses/strict/1.0.0, https://cmux.dev, https://cmux.dev`, http://filev2.getsession.org/file/, https://slsa.dev/provenance/v1 (+2 more) - domains: polyformproject.org, cmux.dev, filev2.getsession.org, slsa.dev, search.sigstore.dev (+1 more) - payloadFileHash: 2ec78d556d696e208927cc503d48e4b5eb56b31abc2870c2ed2e98d6be27fc96

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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	cmux-agent-mcp	0.1.6 (affected)	—

References

Malicious npm package: cmux-agent-mcp

advisory

vendor

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