CVE-2021-32837: mechanize fixed in dd05334448e9f39814bab044d2eaa5ef69b410d6 and 0.4.6

CVE-2021-32837 PUBLISHED CVSS 7.5 HIGH

mechanize vulnerable to ReDoS

Reported by github_m · Published January 17, 2023

mechanize is fixed in dd05334448e9f39814bab044d2eaa5ef69b410d6 and 0.4.6 (PyPI)

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.

Fixed versions

Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.

Package	Ecosystem	Fixed in
mechanize	PyPI	dd05334448e9f39814bab044d2eaa5ef69b410d6, 0.4.6
mechanize	RubyGems	0.4.6
mechanize	mechanize_project	0.4.6
mechanize	python-mechanize	0.4.6

Risk scores

CVSS 3.1

7.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Vendor	Product	Versions
python-mechanize	mechanize	0.4.6
PyPI	mechanize	0
python-mechanize	mechanize	0.4.6
RubyGems	mechanize	0

Timeline

Jan 17, 2023 CVE Published
Jan 18, 2023 EPSS Score (30 in total, the first dated here)
Dec 22, 2025 CVE Updated
Mar 10, 2026 Security Advisory (3 in total, the first dated here)
Aug 1, 2026 Coalition ESS Score

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References

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