promptflow-runtimePyPI
Advisory published Updated
promptflow-runtime is a confirmed malicious PyPI package (MAL-2026-3035) that steals credentials and exfiltrates sensitive data (malicious version 99999999.0.0). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in promptflow-runtime (PyPI)
What this malware does
During import, package collects basic information about the system, performs deep fingerprinting, and reports the data to the remote target. The package description attempts to build an impression it's an official package. The package name refers to the Docker image used by Microsoft's project: https://github.com/microsoft/promptflow/blob/6bfdec06ef16d875ca3b1744a1ef133f08c35340/docs/cloud/azureai/runtime-change-log.md?plain=1#L8
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2026-04-promptflow-runtime
Reasons (based on the campaign):
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The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.
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dependency-confusion
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impersonation
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The package contains code to detect if it is running in a sandbox environment.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Search your lockfiles and build artifacts for promptflow-runtime (version 99999999.0.0).
If you installed it — respond
promptflow-runtime 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 promptflow-runtime 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
Campaign
References
Credits
- Kamil Mańkowski (kam193) · reporter
Detect & block this
O3 blocks promptflow-runtime-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.