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CriticalPyPI2 affected versions

telnyx

telnyx has 2 versions on PyPI flagged in 1 incident we track. Other versions of this package are not implicated - only the exact versions listed below were named by the source advisories.

Affected versions

Check what you actually have installed with pip show telnyx.

  • telnyx@4.87.2
  • telnyx@4.87.1

The incident that flagged it

Critical

Telnyx Python SDK hides credential stealer in WAV-file steganography

TeamPCP published malicious telnyx 4.87.1 and 4.87.2 to PyPI on 27 March 2026 (~670k monthly downloads). Trojanised _client.py downloads steganographic payloads disguised as .wav files over plaintext HTTP, extracts the credential stealer, and persists. Windows variant drops msbuild.exe to the Startup folder; Linux variant uses a user-level systemd service. AES-256-CBC + RSA-4096 envelope for exfil.

Versions named here: 4.87.1, 4.87.2

What to do if you installed one of these

Treat the machine as compromised rather than simply upgrading. Packages in these incidents typically execute at install time, so the payload has already run with whatever credentials were in the environment.

  1. 1.Rotate every credential that machine or CI job could reach - registry tokens, cloud keys, SSH keys, CI secrets - from a different machine.
  2. 2.Pin to a version not listed above, then reinstall from a clean lockfile.
  3. 3.Clear caches and private mirrors. Artifactory, Nexus, Verdaccio, and devpi routinely keep serving a tarball after the public registry has pulled it.
  4. 4.Read the incident write-up above - recommended actions differ per incident, and some have specific indicators of compromise worth grepping your logs for.

Check your whole project

telnyx is one of many packages in these incidents, and it is usually pulled in as a transitive dependency rather than one you installed directly. Paste your requirements.txt to check every dependency at once - it runs in your browser and nothing is uploaded.

Check my requirements.txt All flagged PyPI packages

Version data comes from the public advisories cited on each incident page. We list only versions those advisories name - we don't infer additional ones. Think this is wrong or incomplete? Tell us.