Advisory Published

USN-5199-1: Python vulnerabilities

First published: Fri Dec 17 2021(Updated: )

It was discovered that the urllib.request.AbstractBasicAuthHandler class in Python contains regex with a quadratic worst-case time complexity. Specially crafted traffic from a malicious HTTP server could cause a regular expression denial of service (ReDoS) condition for a client. (CVE-2021-3733) It was discovered that the Python urllib http client could enter into an infinite loop when incorrectly handling certain server responses (100 Continue response). Specially crafted traffic from a malicious HTTP server could cause a denial of service (DoS) condition for a client. (CVE-2021-3737)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libpython3.6-stdlib<3.6.9-1~18.04ubuntu1.6
3.6.9-1~18.04ubuntu1.6
=18.04
All of
ubuntu/python3.6<3.6.9-1~18.04ubuntu1.6
3.6.9-1~18.04ubuntu1.6
=18.04
All of
ubuntu/python3.6-minimal<3.6.9-1~18.04ubuntu1.6
3.6.9-1~18.04ubuntu1.6
=18.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for Python vulnerabilities?

    The vulnerability ID for Python vulnerabilities is CVE-2021-3733.

  • What is the impact of CVE-2021-3733?

    CVE-2021-3733 could cause a regular expression denial of service (ReDoS) condition for a client.

  • Which software versions are affected by CVE-2021-3733?

    Python versions 3.6.9-1~18.04ubuntu1.6 and earlier are affected by CVE-2021-3733.

  • How can I fix CVE-2021-3733?

    To fix CVE-2021-3733, update to Python version 3.6.9-1~18.04ubuntu1.6 or later.

  • Where can I find more information about Python vulnerabilities?

    You can find more information about Python vulnerabilities in the Ubuntu Security Notices USN-5199-1 and the associated CVE links.

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