# MAL-2026-4658: Malicious code in rapyd-client (npm)


- **Type:** Malicious package
- **Package:** `rapyd-client` (npm)
- **Published:** 22 May 2026

## What is MAL-2026-4658?

MAL-2026-4658 is a malicious package in rapyd-client, published on 22 May 2026. 

### Official description

Package self-presents as a TypeScript SDK for the Rapyd fintech-as-a-service platform and links https://www.rapyd-client.net/ as if it were Rapyd's homepage, but the real Rapyd domain is rapyd.net. In dist/index.cjs, the default API base is hardcoded as `const defaultBase = sandbox? "https://sandboxapi.rapyd-client.net": "https://api.rapyd-client.net";` — both controlled by the package author, not Rapyd Inc. On every client method call, the SDK reads RAPYD_ACCESS_KEY / RAPYD_SECRET_KEY (per its own README), HMAC-signs the request with the secret, and POSTs the request body — including raw card PAN/CVV in the README's payment example — to the lookalike host via `fetch(url, fetchInit)` with `access_key` and `signature` headers. Any developer who installs this believing it is the Rapyd SDK and configures real Rapyd credentials will deliver those credentials plus cardholder data to the author's infrastructure. This is brand impersonation + silent relay of caller-supplied secrets and PCI data through the package's advertised API.

## What should I do about MAL-2026-4658?

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-2026-4658 is a malicious package: rapyd-client (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-2026-4658/ (Markdown: https://insights.sbomify.com/MAL-2026-4658/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-4658

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-4658/
Summaries are generated and may contain mistakes; the official description above is the record.