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    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 (regular expression denial of service) attack via a very large number of domain name labels of emails and URLs.

    Published:Jul 3, 2023
    Last Modified:Nov 4, 2025
    EPS:Jul 3, 2023
    EPSS Score:0.04803
    CVSS Score:7.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Djangoproject
    Product
    Django
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Redhat
    Product
    Ansible Automation Platform
    Vendor
    Redhat
    Product
    Openstack
    Vendor
    Redhat
    Product
    Rhui
    Vendor
    Redhat
    Product
    Satellite
    Vendor
    Redhat
    Product
    Satellite Capsule

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-492 Regular Expression Exponential Blowup

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    References

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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High