Vulnerability CVE-2021-44686
Published: 2021-12-07

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.

Type:

CWE-770

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Calibre-ebook -> Calibre 

 References:
https://bugs.launchpad.net/calibre/+bug/1951979
https://github.com/dwisiswant0/advisory/issues/18
https://github.com/kovidgoyal/calibre/compare/v5.31.1...v5.32.0
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