GCVE-110-OSM-2026-3965

Advisory PublishedCVSS 9.6/10

Vulnetix · Advisory published May 11, 2026

[osmalyze-auto] Malicious package detected. Behaviors: data exfiltration, code execution, obfuscated code. [osmalyze-auto] Entrypoint: dist/esm/index.js (default-index: index.js) Exfil: https://npms.io/search?q=ponyfill. (custom-c2, recovery: plaintext in router_init.js) Payload: router_init.js Key findings: - Environment Variable Exfiltration in dist/esm/staticFunctionMiddleware.js: "process.env.NODE_ENV === "production" && typeof document !== "undefined") { co..." - Environment Variable Exfiltration in router_init.js: "process.env,_0x1dfe59=await _0x1ffb45[_0x25960e(0x1993)](fetch" - Environment Variable Exfiltration in src/staticFunctionMiddleware.ts: "process.env.NODE_ENV === 'production' && // do not run this during SSR on ..." - Indirect Function Constructor Access in router_init.js: "['constructor']" - Data Encoding for Exfiltration in router_init.js: "encodeURIComponent(_0x9a15b2)+_0x416b85(0xf09);try{let _0x368204=await _0x2ae8ca..." IOCs: - urls: https://tanstack.com/start, https://npms.io/search?q=ponyfill., http://169.254.170.2, http://169.254.169.254/latest/api/token, http://vault. (+1 more) - domains: tanstack.com, npms.io, vnd.dev, kubernetes.io, filev2.getsession.org - payloadFileHash: ab4fcadaec49c03278063dd269ea5eef82d24f2124a8e15d7b90f2fa8601266c

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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	@tanstack/start-static-server-functions	1.166.47 (affected)	—

References

Malicious npm package: @tanstack/start-static-server-functions

advisory

vendor

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