MAL-2026-16380Published

Malicious code in chai-logger (npm)

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osv · MAL-2026-16380

Published

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (566e54855d730e8555b93da4f8ea81faba72645079a7adcc3a05ea8bf8ad8ee6) The package presents itself as a Chai logging plugin but its main entry `index.js` requires `./lib/query.js`, a ~4 MB obfuscator.io-encoded module (23,868-entry rotated string array, T/j decoder wrappers, hex-property indirection) that executes at the top level as soon as the package is required. The remaining files under `lib/` (proto.js, levels.js, tools.js, etc.) are verbatim copies of pino source, unrelated to the advertised Chai plugin API — a cover story around the obfuscated blob. `package.json` declares `axios ^1.10.0` as a runtime dependency, and the only reference to axios in the shipped code is inside the obfuscated body of `lib/query.js`, giving the payload an HTTP client whose destination is reconstructed at runtime from the rotated string array. Author metadata points to `jsonspack.com`, unrelated to Chai or pino. The combination of import-time execution of a heavily obfuscated payload, a mismatched cover story, copied third-party source used as filler, and an HTTP client declared only for use inside the obfuscated code is the canonical npm credential/data-stealer shape.

Source published: 22 Sep 2026 13:58:43 UTC
Source modified: 22 Sep 2026 14:30:06 UTC
Saved here: 24 Oct 2026 13:17:17 UTC
Source terms: OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · OSV · upstream source license applies. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.