CVE-2021-44686

Published Dec 6, 2021 CVSS 3.1 · 7.5 High EPSS 5.2% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-3862-1 calibre security update
EUVD EUVD EUVD-2021-31502 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.
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Nov 4, 2025, 4:09 PM
Reserved
Dec 6, 2021, 12:00 AM
Status
Modified
Published
Dec 7, 2021, 12:15 AM
Modified
Jun 17, 2026, 4:12 AM