# MAL-2026-4286: Malicious code in polymarket-data-fetcher (PyPI)


- **Type:** Malicious package
- **Package:** `polymarket-data-fetcher` (PyPI)
- **Published:** 24 May 2026

## What is MAL-2026-4286?

MAL-2026-4286 is a malicious package in polymarket-data-fetcher, published on 24 May 2026. 

### Official description

The code attempts to monitor the clipboard and replace copied cryptocurrency addresses, as well as establish persistence.

---

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-05-polymarket-data-fetcher

Reasons (based on the campaign):

 - peristence-autorun

 - obfuscation

 - crypto-related

 - The package contains code to detect if it is running in a sandbox environment.

 - clipboard-modify

 - persistence

## What should I do about MAL-2026-4286?

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-2026-4286 is a malicious package: polymarket-data-fetcher (PyPI). 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-2026-4286/ (Markdown: https://insights.sbomify.com/MAL-2026-4286/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-4286

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-4286/
Summaries are generated and may contain mistakes; the official description above is the record.