Which versions of cv-train are malicious?

The following PyPI versions of cv-train are flagged malicious: 0.0.5, 99.0.0. Treat any of these as compromised.

How do I remediate cv-train if I installed it?

cv-train 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 cv-train — how do I know if it already compromised me?

If cv-train 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 cv-train part of a known attack campaign?

Yes — cv-train is associated with the GENERIC-standard-pypi-install-pentest, IN-MAL-2026-019714 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 cv-train across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for cv-train (2 malicious versions).

Malicious package

cv-trainPyPI

Advisory published Sep 7, 2026Updated Sep 8, 2026

cv-train is a confirmed malicious PyPI package (MAL-2026-16016) that steals credentials and exfiltrates sensitive data (malicious versions 0.0.5, 99.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in cv-train (PyPI)

MAL-2026-16016

Immediate action

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

pip uninstall cv-train

What this malware does

setup.py defines a phone_home() function invoked at module top level, so it runs during pip install. The function collects the machine hostname, username, current working directory, and the path of any discovered pip.conf, then transmits these values to a hardcoded webhook.site callback via both a DNS lookup and a plaintext HTTP GET to http://webhook.site/2271fec9-1e0d-4a8c-a1c9-b5b0cb9d2b04/cv-train?pkg=...&host=...&user=...&cwd=...&pip_conf=.... The shipped Python module itself is an empty stub; the package's metadata and print statements advertise it as a dependency-confusion proof of concept targeting the name 'cv-train', so any environment with an internal package of that name and a misconfigured index resolution would install this beacon in place of the intended dependency.

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

2 flagged

0.0.599.0.0

Indicators of compromise (SHA-256)

291eeeae57d4bc439348ef96b08581d69e1160508cc156acfcd8d74b94ead981

3e63e889d2bfc807902ef5bcd86b6d65b95272587726dda61e4efb63d461fc3b

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for cv-train (2 malicious versions).
If you installed it — respond
cv-train 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 cv-train 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. cv-train on PyPI has been identified as a malicious package (versions 0.0.5, 99.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

GENERIC-standard-pypi-install-pentestIN-MAL-2026-019714

References

Credits

Amazon Inspector · finder
Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks cv-train-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