CVE-2021-44686

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published12/7/2021

Last Modified11/4/2025

Sourcenvd

Honeypot Sightings0

Affected Products

calibre-ebook:calibrefedoraproject:fedora

Weaknesses (CWE)

CWE-400

References

https://bugs.launchpad.net/calibre/+bug/1951979(cve@mitre.org)

https://github.com/dwisiswant0/advisory/issues/18(cve@mitre.org)

https://github.com/kovidgoyal/calibre/compare/v5.31.1...v5.32.0(cve@mitre.org)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W7QKFPYJ23KG6WJ5NIYAM4N2NWZCLQGL/(cve@mitre.org)

https://bugs.launchpad.net/calibre/+bug/1951979(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/dwisiswant0/advisory/issues/18(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/kovidgoyal/calibre/compare/v5.31.1...v5.32.0(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2024/09/msg00005.html(af854a3a-2127-422b-91ae-364da2661108)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W7QKFPYJ23KG6WJ5NIYAM4N2NWZCLQGL/(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.