Regular Expression Denial of Service (ReDoS) Vulnerability in calibre's html_preprocess_rules

Regular Expression Denial of Service (ReDoS) Vulnerability in calibre's html_preprocess_rules

CVE-2021-44686 · HIGH Severity

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

calibre before 5.32.0 contains a regular expression that is vulnerable to ReDoS (Regular Expression Denial of Service) in html_preprocess_rules in ebooks/conversion/preprocess.py.

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