LWA-2026-10989 confirmed malware

bs58-33@6.0.1

Malicious code in bs58-33 (npm)

T1195.002 · Compromise Software Supply ChainT1195 · Supply Chain Compromise

Analysis

bs58-33@6.0.1 is a trojanized clone of the legitimate bs58 base58-encoding library. The package source is copied verbatim from the real cryptocoinjs/bs58, but its runtime dependency is replaced: instead of the legitimate `base-x` library, it depends on `base65-33x`, a malicious package. The package's only code is `import basex from 'base65-33x'`, so any project that installs bs58-33 pulls in and executes the malicious dependency. The package has no repository of its own and no other functionality beyond forwarding to the substituted dependency.

analyzed by
Leitwacht
first seen
Aug 11, 2026, 01:24 PM
analyzed
Aug 11, 2026, 01:25 PM

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Independently detected by the Leitwacht supply-chain probe. IOCs are defanged. Published CC0. Think this is a mistake? See the dispute policy.