Vulnerability Database

322,933

Total vulnerabilities in the database

CVE-2021-44686

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.

  • Published: Dec 7, 2021
  • Updated: Nov 5, 2025
  • CVE: CVE-2021-44686
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2:

  • Severity: Medium
  • Score: 5
  • AV:N/AC:L/Au:N/C:N/I:N/A:P

CWEs:

Software From Fixed in
calibre-ebook / calibre - 5.32.0
fedoraproject / fedora 34 34.x