typedecode (npm) · Malicious Code
Affects typedecodeSource GCVE Database
Malicious package : remove typedecode and rotate any secrets on hosts that installed it.
Data as of 9 Jul 2026, 09:38 UTC
Malicious package
Published to npm · OSV MAL-2026-6476
What to do
Remove typedecode from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| npmtypedecode | Affected
| Fixed in– |
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Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (593662d3b4cda901642b713f419417807a33f3dca74e818f66e8d0cf9ebcf6e3) On `require('typedecode')` / `import 'typedecode'`, the bundled `dist/index.cjs` and `dist/index.js` execute an obfuscated import-time payload. A `bootstrap.js` IIFE exposes `require` and `module` on `global`, deobfuscates two large strings through a custom permutation (`YWG`), constructs a function via the `Function` constructor (`AQq(erE, YWG(fvm))`), invokes it on a second decoded payload to produce `XZs`, then calls `XZs(7942)` and brands `global._V = 'A6-Shadow-15'`. The deliberate placement of `require`/`module` on globals before the IIFE allows the decoded code to dynamically load arbitrary Node modules (fs, http, child_process, etc.) without any static reference. The package's API surface and inline comments are copied verbatim from the legitimate `decoders` package by nvie (including the email-regex comment and the pojo detection comment), and the README API (`object`, `array`, `optional`, `string`, `number`, `email`, `url`, `uuid`, `decode`/`verify`/`value`, `formatInline`, `formatShort`) duplicates that library — an impersonation lure to drive installs of the hidden loader. Author is the placeholder-style `chavanetsanastasia-netizen`. ## Source: ghsa-malware (bedd4815e96aa992468ab037dbd2c342b8567f07ece45674dd8a274c4e479912) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.