---
id: CVE-2022-40897
aliases:
  - GHSA-r9hx-vwmv-q579
  - BIT-setuptools-2022-40897
  - PYSEC-2022-43012
title: pypa/setuptools vulnerable to Regular Expression Denial of Service (ReDoS)
summary: pypa/setuptools vulnerable to Regular Expression Denial of Service (ReDoS)
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: setuptools
product: setuptools
ecosystem: pip
affected:
  - setuptools < 65.5.1
patched:
  - setuptools 65.5.1
published: '2022-12-23'
updated: '2026-08-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-r9hx-vwmv-q579'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2022-40897'
  - url: 'https://github.com/pypa/setuptools/issues/3659'
  - url: >-
      https://github.com/pypa/setuptools/commit/43a9c9bfa6aa626ec2a22540bea28d2ca77964be
  - url: 'https://setuptools.pypa.io/en/latest'
  - url: 'https://security.netapp.com/advisory/ntap-20240621-0006'
  - url: 'https://security.netapp.com/advisory/ntap-20230214-0001'
  - url: 'https://pyup.io/vulnerabilities/CVE-2022-40897/52495'
  - url: >-
      https://pyup.io/posts/pyup-discovers-redos-vulnerabilities-in-top-python-packages
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YNA2BAH2ACBZ4TVJZKFLCR7L23BG5C3H
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ADES3NLOE5QJKBLGNZNI2RGVOSQXA37R
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YNA2BAH2ACBZ4TVJZKFLCR7L23BG5C3H
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ADES3NLOE5QJKBLGNZNI2RGVOSQXA37R
  - url: 'https://lists.debian.org/debian-lts-announce/2024/09/msg00018.html'
  - url: 'https://github.com/pypa/setuptools/compare/v65.5.0...v65.5.1'
  - url: >-
      https://github.com/pypa/setuptools/blob/fe8a98e696241487ba6ac9f91faa38ade939ec5d/setuptools/package_index.py#L200
  - url: 'https://github.com/pypa/setuptools'
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/setuptools/PYSEC-2022-43012.yaml
tags:
  - osv
  - pip
epss: 0.02617
epssPercentile: 0.84783
ingestedAt: '2026-08-07T19:14:14.634Z'
---

## Overview

Python Packaging Authority (PyPA)'s setuptools is a library designed to facilitate packaging Python projects. Setuptools version 65.5.0 and earlier could allow remote attackers to cause a denial of service by fetching malicious HTML from a PyPI package or custom PackageIndex page due to a vulnerable Regular Expression in `package_index`. This has been patched in version 65.5.1.

## Affected packages

- `setuptools < 65.5.1`

## Remediation

Upgrade to a patched release:

- `setuptools 65.5.1`