pantheon-agents

Details

**Severity:** Critical

**Affected versions:** `= 0.6.1`

## Source: amazon-inspector (1ee06d7aabbdf76969119c2f986e18bbc7f0dcac59ae9cae4f7a04798f2d083d)
The package installs `pantheon_agents-setup.pth` into site-packages, which Python auto-executes at every interpreter startup (broader than import-time, fires on any `python` invocation regardless of whether the package is imported). The single-line.pth body wraps its payload in `exec()` of an obfuscated string using systematically renamed single-letter aliased imports (`os as _O`, `tempfile as _T`, `urllib.request as _u`, `subprocess as _s`, `platform as _p`, etc.), which hides `urllib.request.urlretrieve`, `zipfile` extraction, `os.chmod`, and `subprocess.run` from static AST inspection. The payload downloads the Bun JavaScript runtime from `https://github.com/oven-sh/bun/releases/download/bun-v1.3.13/bun-{platform}-{arch}.zip` to `/tmp/b/bun`, chmods it 0o775, and runs it against a `_index.js` file resolved by glob across `pantheon/*/_index.js`. A sentinel file at `/tmp/.bun_ran` gates re-execution. Two compounding harms: (1) Python startup performs unconditional outbound network fetch and writes/executes a fetched binary outside Python's view — the alternate-runtime-dropper pattern; (2) any sibling package (or future update) that drops a file at `pantheon/*/_index.js` is silently executed by the dropped Bun binary at every Python startup, providing a persistent execution sink. The combination of `.pth` auto-execution, `exec()`-wrapped obfuscation, and remote-runtime fetch+execute is a textbook supply-chain-attack fingerprint.

## Source: kam193 (57f0e964aed446fe82998f13d1cbc577bff274378d980b551e4c134d093ab016)
Versions 0.6.1, 0.6.2 were compromised.


Compromised packages start an obfuscated infostealer. The infostealer is a heavily obfuscated JavaScript code executed using Bun runtime on Python startup. It collectes all kinds of sensitive data, including API keys, credentials to package repositories, cryptocurrency assets, password manager data. Infostealer actively queries online services to collect additional se […]

**References:**
- https://bad-packages.kam193.eu/pypi/campaign/2026-06-compr-woodpecker
- https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/pantheon-agents/MAL-2026-5299.json
- https://o3.security/blog/pypi-supply-chain-attack-pth-file-miasma
- https://pypi.org/project/pantheon-agents/0.6.1
- https://socket.dev/blog/mini-shai-hulud-campaign-hits-red-hat-cloud-services-npm-packages
- https://socket.dev/blog/mini-shai-hulud-miasma-and-hades-worms-target-bioinformatics-and-mcp-developers-via-malicious
- https://socket.dev/blog/shai-hulud-descends-to-hades-miasma-pypi-wave
- https://github.com/advisories/GHSA-pg8g-5p4j-q7fj

Compromised versions (1)

• = 0.6.1

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.