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CVE-2021-44686

Published: 7 December 2021

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.

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
calibre
Launchpad, Ubuntu, Debian
bionic Needed

focal Needed

hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Needed

kinetic Ignored
(end of life, was needed)
lunar Not vulnerable
(6.3.0+dfsg-2)
mantic Not vulnerable
(6.3.0+dfsg-2)
noble Not vulnerable
(6.3.0+dfsg-2)
trusty Ignored
(end of standard support)
upstream
Released (5.33.0)
xenial Needs triage

Patches:
upstream: https://github.com/kovidgoyal/calibre/commit/235b7e38c197ba4a3c17531e516610af8795e348

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H