CVE-2021-44686

PoC ×2—

CVSS 3.1

7.5 high

EPSS

5%p92

Published

Dec 7, 2021 (Dec 7, 2021)

Modified

Jun 17, 2026

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.

Vendors: calibre-ebook fedoraproject
Products: calibre, fedora
Weakness: CWE-400
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (5.0%)

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