# MAL-2026-10779: Malicious code in mlflow-ui (PyPI)


- **Type:** Malicious package
- **Package:** `mlflow-ui` (PyPI)
- **Published:** 18 Jul 2026

## What is MAL-2026-10779?

MAL-2026-10779 is a malicious package in mlflow-ui, published on 18 Jul 2026. 

### Official description

The package impersonates the MLflow project (author 'MLflow Community' <community@mlflow.org>, homepage https://github.com/mlflow/mlflow) but provides no MLflow UI functionality. Both setup.py (install time) and mlflow_ui/__init__.py (import time) execute payload_core.py, which collects hostname, platform, the full process environment (dict(os.environ)), /etc/hosts, /etc/resolv.conf, /proc/self/cgroup, /proc/1/cmdline, directory listings of /, /app, /opt, /srv, /home, /tmp, and the output of `id`, `ps aux`, and `ip addr`, along with internal-network probe results. The data is base64-encoded and POSTed to https://webhook.site/9510ba0a-29f7-4ce6-afe7-632c92cf0f41/piprecon over TLS with verification disabled (ssl._create_unverified_context()). The same module fetches a second-stage Python payload from https://webhook.site/a9f5802b-c77e-4226-99dd-bc89d7dc8cca/s2.py and passes the bytes to compile()+exec() with subprocess and os bound in globals, yielding arbitrary remote code execution on the installer's host at both install and import time. Bulk environment scraping captures AWS_*, GH_TOKEN, npm/PyPI tokens, database URLs, and any other CI/build secrets present.

During installation, the package first collects local information, environment variables, and probes connections to typically expected services like databanks. Results are exfiltrated and then, the next stage code is downloaded and executed. It then continues exfiltrating data by looking for credentials to databases, exfiltrating SQLite databases and bruteforcing&exfiltrating other databases reachable from the running environment.

This package was created by Anthropic's AI agent during an internal experiment in a wrongly configured test environment.

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Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-07-mlflow-ui

Reasons (based on the campaign):

 - files-exfiltration

 - exfiltration-env-variables

 - dependency-confusion

 - Downloads and executes a remote malicious script.

 - exfiltration-credentials

 - network-scan

 - exfiltration-cloud-tokens

## What should I do about MAL-2026-10779?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-10779 is a malicious package: mlflow-ui (PyPI). Every version was published to cause harm.

Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.

Reference: https://insights.sbomify.com/MAL-2026-10779/ (Markdown: https://insights.sbomify.com/MAL-2026-10779/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-10779

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-10779/
Summaries are generated and may contain mistakes; the official description above is the record.