CVE-2021-44686

HIGH

calibre < 5.32.0 - Denial of Service via ReDoS in HTML Preprocessing

Title source: llm

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.

References (5)

Core 5

Core References

Exploit, Issue Tracking, Vendor Advisory x_refsource_misc

https://bugs.launchpad.net/calibre/+bug/1951979

Exploit, Issue Tracking, Patch, Third Party Advisory x_refsource_misc

https://github.com/dwisiswant0/advisory/issues/18

Patch, Third Party Advisory x_refsource_misc

https://github.com/kovidgoyal/calibre/compare/v5.31.1...v5.32.0

Mailing List, Third Party Advisory vendor-advisory x_refsource_fedora

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

Mailing List

https://lists.debian.org/debian-lts-announce/2024/09/msg00005.html

Scores

CVSS v3 7.5

EPSS 0.0041

EPSS Percentile 61.6%

Attack Vector NETWORK

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

Details

CWE

CWE-400

Status published

Products (2)

calibre-ebook/calibre < 5.32.0

fedoraproject/fedora 34

Published Dec 07, 2021

Tracked Since Feb 18, 2026