CVE-2021-32837: Inefficient Regular Expression Complexity

January 17, 2023 (updated June 20, 2023)

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/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6
github.com/python-mechanize/mechanize/releases/tag/v0.4.6
nvd.nist.gov/vuln/detail/CVE-2021-32837
securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/

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