Bug 2031837 (CVE-2021-44686)

Summary:	CVE-2021-44686 calibre: ReDoS vulnerability in html_preprocess_rules in ebooks/conversion/preprocess.py
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	adscvr, chkr, helio, Kartz, kevin, nushio, zbyszek
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-12-13 15:04:42 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2031838
Bug Blocks:

Description Guilherme de Almeida Suckevicz 2021-12-13 14:24:14 UTC

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:
https://bugs.launchpad.net/calibre/+bug/1951979
https://github.com/dwisiswant0/advisory/issues/18

Comment 1 Guilherme de Almeida Suckevicz 2021-12-13 14:24:27 UTC

Created calibre tracking bugs for this issue:

Affects: fedora-all [bug 2031838]

Comment 2 Product Security DevOps Team 2021-12-13 15:04:41 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.