MAL-2026-4286 Malicious code in polymarket-data-fetcher (PyPI)
Malicious package
Published
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)
- Package
- polymarket-data-fetcher
- Registry
- PyPI
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.