Which versions of flashinfer are malicious?

The following PyPI versions of flashinfer are flagged malicious: 1.0.0. Treat any of these as compromised.

How do I remediate flashinfer if I installed it?

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

If flashinfer 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 flashinfer part of a known attack campaign?

Yes — flashinfer 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 flashinfer across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for flashinfer (version 1.0.0).

Malicious package

flashinferPyPI

Advisory published Jul 26, 2024Updated Dec 3, 2025

flashinfer is a confirmed malicious PyPI package (MAL-2024-12273) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in flashinfer (PyPI)

MAL-2024-12273

Immediate action

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

pip uninstall flashinfer

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

1.0.0

Indicators of compromise (SHA-256)

978ef5cc631ee009344bab9a6627a407da02030314a40a7db0e77bd427d837a8

8f37cdcaf6d8e49fa378d094adfdf1b38ea91cd3cf9fc2569db03e514c871a0d

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for flashinfer (version 1.0.0).
If you installed it — respond
flashinfer 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 flashinfer 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. flashinfer on PyPI has been identified as a malicious package (version 1.0.0 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)

Detect & block this

O3 blocks flashinfer-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