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.
Published: 2021-12-06
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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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.
History

Tue, 04 Nov 2025 16:30:00 +0000

Type Values Removed Values Added
References

Subscriptions

Calibre-ebook Calibre
Fedoraproject Fedora
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2025-11-04T16:09:27.961Z

Reserved: 2021-12-06T00:00:00.000Z

Link: CVE-2021-44686

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2021-12-07T00:15:08.087

Modified: 2025-11-04T16:15:45.927

Link: CVE-2021-44686

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses