python-mechanize/mechanize · Security
mechanize Regular Expression Denial of Service vulnerability
- GHSA ID
- GHSA-g3pv-pj5f-3hfq
- CVE ID
- CVE-2021-32837
- Severity
- high
- Published
- Updated
- CVSS
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS v3
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS v4
- 8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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.
CWEs
- CWE-1333 · Inefficient Regular Expression Complexity
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-32837 ↗
- https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6 ↗
- 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://github.com/pypa/advisory-database/tree/main/vulns/mechanize/PYSEC-2023-25.yaml ↗
- https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize ↗
- https://lists.debian.org/debian-lts-announce/2025/12/msg00028.html ↗
- https://github.com/advisories/GHSA-g3pv-pj5f-3hfq ↗