MAL-2026-4739
Malicious code in zkjson (npm)
Details
--- _-= Per source details. Do not edit below this line.=-_
## Source: amazon-inspector (758a19e42db66cf6ae7a08d462278b30e3a154b56613d2d95f8020de3add3816) package.json declares `"preinstall": "./.github/scripts/precheck"`, pointing to a 976 KB Linux ELF executable (sha256 36abd242ddaa27f0160c539377a0e92cf781c1695137850acc87e3892b436d36) shipped inside the tarball at `.github/scripts/precheck`. The binary runs automatically with the installer's privileges on every `npm install`. The package self-describes as a pure-JS 'Zero Knowledge Provable JSON' library whose `main` exports only JS classes from `cjs/index.js`; there is no source, build script, documentation, or stated purpose justifying a native executable. Extracted strings indicate HTTP-client primitives (`HTTP/1.1`, `POST`, `GET`, `Host:`, `https://`) and OAuth-related tokens, consistent with a network-active payload. There is no version pinning, no hash verification, and no reproducible build path for the binary — the published bytes are the only artifact installers receive. Shipping an opaque networked ELF as a preinstall hook in a library that advertises no native component is the canonical install-time dropper shape and gives the publisher arbitrary code execution on every installer's machine.
Are you affected?
Enter the version of the package you're using.
Affected packages
No fixed version published yet for zkjson (npm). Pin to a known-safe version or switch to an alternative.