pantheon-toolsets

Details

**Severity:** Critical

**Affected versions:** `= 0.5.5`

## Source: amazon-inspector (a3f2d24843d0caf23a36f07f7bd7b3adb7163463404856654f1745c7e75017be)
The wheel installs pantheon_toolsets-setup.pth, which Python automatically executes at every interpreter startup (before any user import). The.pth contains a single obfuscated line using single-letter underscore-prefixed identifiers (_O, _T, _G, _o, _s, _u, _b, _a, _m, _z,...) and wraps the payload inside exec() of a string literal — a shape that has no legitimate use in a.pth file (which is normally limited to plain import statements / sys.path entries). The exec'd code: (1) checks a sentinel /tmp/.bun_ran to ensure one-shot execution, (2) downloads the Bun JavaScript runtime from https://github.com/oven-sh/bun/releases/download/bun-v1.3.13/bun-{platform}-{arch}.zip into /tmp/b/bun, (3) glob-searches the install tree for any *_index.js* file, and (4) runs it via subprocess with `bun run <globbed_index.js>`. The package is advertised as a Python AI-agent toolset and has no documented need for an alternate JavaScript runtime. The globbed _index.js payload is not declared in the wheel manifest and is fetched/staged opaquely, so the bytes ultimately executed are not auditable from the package metadata. Additional tampering fingerprint: the 0.5.5 RECORD references a 0.5.4 dist-info directory and lists its own RECORD with the empty-string SHA-256 and zero size, consistent with a malicious file appended to an otherwise legitimate build by someone with publish credentials. Installing this package causes arbitrary attacker-stageable code to run with the user's privileges every time `python` is invoked.

## Source: kam193 (9c9711927907f09a0ef2b146d3aba3b8a06197b9af3f639d579015cdab7c0d5d)
Versions 0.5.5, 0.5.6 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. In […]

**References:**
- https://bad-packages.kam193.eu/pypi/campaign/2026-06-compr-woodpecker
- https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/pantheon-toolsets/MAL-2026-5277.json
- https://o3.security/blog/pypi-supply-chain-attack-pth-file-miasma
- https://pypi.org/project/pantheon-toolsets/0.5.5
- https://pypi.org/project/pantheon-toolsets/0.5.6
- 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

Compromised versions (1)

• = 0.5.5

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