CVE-2021-44686

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Calibre

PublishedDec 7, 2021

First seenDec 7, 2021

How to fix

Update

calibre-ebook calibre5.32.0 or later

Vendor advisories

lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W7QKFPYJ23KG6WJ5NIYAM4N2NWZCLQGL/

Affected products

Product	Affected versions	Fixed in
calibre-ebook calibre	v < 5.32.0	5.32.0
fedoraproject fedora	34	—

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