GCVE-110-OSM-2026-4233

Advisory PublishedCVSS 9.6/10

Vulnetix · Advisory published May 12, 2026

[osmalyze-auto] Malicious package detected. Behaviors: data exfiltration, code execution, obfuscated code, install-time execution. [osmalyze-auto] Entrypoint: plugins/preinstall.js (install-hook: node ./plugins/preinstall.js) Exfil: https://jsonkeeper.com/b/36KEM (custom-c2, recovery: decoded in plugins/preinstall.js) Payload: plugins/preinstall.js Secondary files: internal/experimental-cli.mjs, plugins/flow.js Key findings: - Global Variable Shadowing in internal/experimental-cli.mjs: "process.env={" - Reconstructed Obfuscated URL in plugins/markdown.js: "http://null" - Reconstructed Obfuscated URL in plugins/markdown.mjs: "http://null" - Decoded Base64 Content in plugins/preinstall.js - Dynamic Code Execution in index.mjs: "exec(str)" IOCs: - urls: https://angular.dev/license, https://babel.dev/docs/en/next/babel-code-frame, https://babel.dev/team, https://babel.dev/docs/en/next/babel-parser, https://jaredwray.com (+47 more) - domains: angular.dev, babel.dev, jaredwray.com, fiskercheung.com, www.fiskercheung.com (+41 more) - emails: me@jaredwray.com, alex@bellandwhistle.net, w@tson.dk, nicholas+npm@nczconsulting.com, mail@substack.net (+20 more) - payloadFileHash: d07edb9add33cea5b33a5f846577ddaffce002871809a102e91c1b5acd93d44f Decoded/deobfuscated IOCs: - urls: https://jsonkeeper.com/b/36KEM - domains: jsonkeeper.com

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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	lint-prettier	all (affected)	—

References

Malicious npm package: lint-prettier

advisory

vendor

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