Bug 2031837 (CVE-2021-44686) - CVE-2021-44686 calibre: ReDoS vulnerability in html_preprocess_rules in ebooks/conversion/preprocess.py
Summary: CVE-2021-44686 calibre: ReDoS vulnerability in html_preprocess_rules in ebook...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-44686
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2031838
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-12-13 14:24 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-12-13 15:04 UTC (History)
7 users (show)

Fixed In Version:
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Last Closed: 2021-12-13 15:04:42 UTC
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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.
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