Which versions of polymarket-data-fetcher are malicious?

The following PyPI versions of polymarket-data-fetcher are flagged malicious: 1.2.4. Treat any of these as compromised.

How do I remediate polymarket-data-fetcher if I installed it?

polymarket-data-fetcher is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed polymarket-data-fetcher — how do I know if it already compromised me?

If polymarket-data-fetcher was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Is polymarket-data-fetcher part of a known attack campaign?

Yes — polymarket-data-fetcher is associated with the 2026-05-polymarket-data-fetcher campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find polymarket-data-fetcher across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for polymarket-data-fetcher (version 1.2.4).

Malicious package

polymarket-data-fetcherPyPI

Advisory published May 24, 2026Updated May 24, 2026

polymarket-data-fetcher is a confirmed malicious PyPI package (MAL-2026-4286) that steals credentials and exfiltrates sensitive data (malicious version 1.2.4). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in polymarket-data-fetcher (PyPI)

MAL-2026-4286

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

pip uninstall polymarket-data-fetcher

What this malware does

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

Malicious versions

1 flagged

1.2.4

Indicators of compromise (SHA-256)

b6b5ac8b803d36ef490adff8a4d3110c4030063bbd2345e4b23d1871909638e9

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for polymarket-data-fetcher (version 1.2.4).
If you installed it — respond
polymarket-data-fetcher is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If polymarket-data-fetcher was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. polymarket-data-fetcher on PyPI has been identified as a malicious package (version 1.2.4 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

2026-05-polymarket-data-fetcher

References

bad-packages.kam193.eu

Credits

Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks polymarket-data-fetcher-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database