Which versions of jec are malicious?

The following PyPI versions of jec are flagged malicious: 39.0.1. Treat any of these as compromised.

How do I remediate jec if I installed it?

jec 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 jec — how do I know if it already compromised me?

If jec 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 jec part of a known attack campaign?

Yes — jec is associated with the GENERIC-standard-pypi-install-pentest 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 jec across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for jec (version 39.0.1).

Malicious package

jecPyPI

Advisory published Jun 12, 2026Updated Jun 12, 2026

jec is a confirmed malicious PyPI package (MAL-2026-5684) that steals credentials and exfiltrates sensitive data (malicious version 39.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in jec (PyPI)

MAL-2026-5684

Immediate action

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

pip uninstall jec

What this malware does

Installing the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.

Category: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research & co, with clearly low-harm possibilities.

Campaign: GENERIC-standard-pypi-install-pentest

Reasons (based on the campaign):

The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.
The package overrides the install command in setup.py to execute malicious code during installation.

Malicious versions

1 flagged

39.0.1

Indicators of compromise (SHA-256)

cfd390b5ea0fe558bd7f5fd56dec8386148e58d7f8d4b6bba14f8a2aa8b6d323

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for jec (version 39.0.1).
If you installed it — respond
jec 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 jec 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. jec on PyPI has been identified as a malicious package (version 39.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

GENERIC-standard-pypi-install-pentest

References

bad-packages.kam193.eu

Credits

Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks jec-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

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