CVE-2021-32837: mechanize Regular Expression Denial of Service vulnerability
(updated )
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.
References
- github.com/advisories/GHSA-g3pv-pj5f-3hfq
- github.com/pypa/advisory-database/tree/main/vulns/mechanize/PYSEC-2023-25.yaml
- github.com/python-mechanize/mechanize
- github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py
- github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6
- github.com/python-mechanize/mechanize/releases/tag/v0.4.6
- lists.debian.org/debian-lts-announce/2023/06/msg00022.html
- lists.debian.org/debian-lts-announce/2025/12/msg00028.html
- nvd.nist.gov/vuln/detail/CVE-2021-32837
- securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize
Code Behaviors & Features
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