GitHub Advisoryadvisory · PyPI
GHSA-g3pv-pj5f-3hfq mechanize Regular Expression Denial of Service vulnerability
HIGH
Official page ↗
- Aliases
- CVE-2021-32837
- Ecosystem
- PyPI
- Packages
- mechanize
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-1333
- Reviewed
- 2023-01-20
Affected packages
• PyPI mechanize: < 0.4.6 → fixed in 0.4.6
Description
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.
Related
Alias · CVE (1)
- CVE-2021-32837 mechanize, a library for automatically interacting with HTTP web servers, contains a regular expression that is vulnerable to regular… vulnerability
Weakness · CWE (1)
- CWE-1333 Inefficient Regular Expression Complexity weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-32837 advisory
- https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6 web
- https://github.com/pypa/advisory-database/tree/main/vulns/mechanize/PYSEC-2023-25.yaml web
- https://github.com/python-mechanize/mechanize package
- https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879 web
- https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6 web
- https://lists.debian.org/debian-lts-announce/2023/06/msg00022.html web
- https://lists.debian.org/debian-lts-announce/2025/12/msg00028.html web
- https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize advisory