Which versions of cvmask are malicious?

Every published version of cvmask on PyPI is considered malicious. Remove the package entirely.

How do I remediate cvmask if I installed it?

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

If cvmask 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.

How do I find cvmask across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for cvmask (all published versions).

Malicious package

cvmaskPyPI

cvmask is a confirmed malicious PyPI package (MAL-2023-2673) that steals credentials and exfiltrates sensitive data. Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in cvmask (PyPI)

MAL-2023-2673

Immediate action

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

pip uninstall cvmask

What this malware does

EsqueleSquad group published nearly 6000 malicious PyPi and NPM packages, executing spyware and information-stealing malware

Malicious versions

all versions

Every published version of this package is considered malicious — remove it entirely.

Indicators of compromise (SHA-256)

a413aa4761f4624d86ce78b6b385521a2d0e943bb06abff62d8ad47c2f020889

Detection & response playbook

Credential / info stealer

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

References

medium.com

Credits

Checkmarx · finder

Detect & block this

O3 blocks cvmask-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