PyPI/mechanize CVE-2021-32837: high 7.5, EPSS 28.87%

mechanize Regular Expression Denial of Service vulnerability

Action: Upgrade mechanize to 0.4.6 or later.

pip install mechanize==0.4.6

Affected

Fixed versions

Sources

• osv: GHSA-g3pv-pj5f-3hfq
• https://nvd.nist.gov/vuln/detail/CVE-2021-32837
• https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6
• https://github.com/pypa/advisory-database/tree/main/vulns/mechanize/PYSEC-2023-25.yaml
• https://github.com/python-mechanize/mechanize
• https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879
• 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

CVE-2021-32837 · published 2023-01-18T00:30:18Z · modified 2025-12-22T16:59:04.476381Z · JSON