VulnerabilityModified
CVE-2021-32837
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.
HIGH 7.5EPSS 28.9%
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 28.9%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 28.87% probability · 98th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-1333
- Affected
- mechanize project/mechanize
- Source
- security-advisories@github.com
References
- https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879Exploit, Third Party Advisory
- https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6Patch, Third Party Advisory
- https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/06/msg00022.html
- https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/Exploit, Third Party Advisory
- https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879Exploit, Third Party Advisory
- https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6Patch, Third Party Advisory
- https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6Third Party Advisory
- 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/Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.