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    Dashboard / CVE / CVE-2021-32837

    CVE-2021-32837

    mechanize, a library for automatically interacting with HTTP web servers, contains a regular expression that is vulnerable to regular expression denial of service (ReDoS) prior to version 0.4.6. If a web server responds in a malicious way, then mechanize could crash. Version 0.4.6 has a patch for the issue.

    Published:Jan 17, 2023
    Last Modified:Dec 22, 2025
    EPS:Jan 17, 2023
    EPSS Score:0.05556
    CVSS Score:7.5

    Affected Products

    Vendor
    Mechanize Project
    Product
    Mechanize

    Exploits

    https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-492 Regular Expression Exponential Blowup

    References

    https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879
    https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6
    https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6
    https://lists.debian.org/debian-lts-announce/2023/06/msg00022.html
    https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/
    https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879
    https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6
    https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6
    https://lists.debian.org/debian-lts-announce/2023/06/msg00022.html
    https://lists.debian.org/debian-lts-announce/2025/12/msg00028.html
    https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/

    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