# MAL-2026-15929: Malicious code in pymaas (PyPI)


- **Type:** Malicious package
- **Package:** `pymaas` (PyPI)
- **Published:** 4 Sep 2026

## What is MAL-2026-15929?

MAL-2026-15929 is a malicious package in pymaas, published on 4 Sep 2026. 

### Official description

On `import pymaas`, top-level code in the package invokes a `_canary()` function that collects the entire `os.environ` dictionary and `socket.gethostname()`, serializes them as JSON, and POSTs the payload via `urllib.request.urlopen` to the hardcoded host `https://vuorblucjega.dssldrf.net/python-install-log/pymaas`. The behavior runs unconditionally on import with no consent, no gating, and no relationship to the destination domain. Combined with the implausibly high version `99.99.0` and the package's own `dependency confusion test` description, the shipped code is a dependency-confusion beacon that harvests any credentials present in the process environment (CI tokens, cloud provider keys, registry auth tokens, database passwords) and delivers them to an external non-publisher host.

During import, the package exfiltrates environment variables.

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

Campaign: 2026-09-amirgo4496

Reasons (based on the campaign):

 - exfiltration-env-variables

 - dependency-confusion

 - The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.

## What should I do about MAL-2026-15929?

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-2026-15929 is a malicious package: pymaas (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-2026-15929/ (Markdown: https://insights.sbomify.com/MAL-2026-15929/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-15929

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-15929/
Summaries are generated and may contain mistakes; the official description above is the record.