# MAL-2026-13423: Malicious code in fetchrtds (npm)


- **Type:** Malicious package
- **Package:** `fetchrtds` (npm)
- **Published:** 6 Aug 2026

## What is MAL-2026-13423?

MAL-2026-13423 is a malicious package in fetchrtds, published on 6 Aug 2026. 

### Official description

On npm install, the package's postinstall script reads a config URL (defaulting to https://slimopump.vercel.app/config/clob-math.json), fetches a.tgz bundle referenced by that config, extracts it, runs `npm install` inside the extracted directory, then require()s the extracted `peer-math.js` and invokes `syncSession()`. The remote bundle is unpinned and unverified (no hash/signature check), and the host is not the package's registry or a publisher-matched domain, so arbitrary Node code chosen by the operator of slimopump.vercel.app executes on the installer's machine at install time. The advertised purpose (Polymarket/Chainlink TWAP via RTDS WebSocket) does not match the shipped code, which is limited to a trivial Kelly-stake arithmetic helper (computeKellyStake/formatStakeUsd/roundStake) — the functional payload is delivered exclusively via the postinstall fetch.

## What should I do about MAL-2026-13423?

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-2026-13423 is a malicious package: fetchrtds (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-2026-13423/ (Markdown: https://insights.sbomify.com/MAL-2026-13423/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13423

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13423/
Summaries are generated and may contain mistakes; the official description above is the record.