Vulnerability 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.
CVSS Score
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Calibre-Ebook | Calibre | < 5.32.0 |
| Fedoraproject | Fedora | 34 |
Related Weaknesses (CWE)
References
- https://bugs.launchpad.net/calibre/+bug/1951979ExploitIssue TrackingVendor Advisory
- https://github.com/dwisiswant0/advisory/issues/18ExploitIssue TrackingPatch
- https://github.com/kovidgoyal/calibre/compare/v5.31.1...v5.32.0PatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://bugs.launchpad.net/calibre/+bug/1951979ExploitIssue TrackingVendor Advisory
- https://github.com/dwisiswant0/advisory/issues/18ExploitIssue TrackingPatch
- https://github.com/kovidgoyal/calibre/compare/v5.31.1...v5.32.0PatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2024/09/msg00005.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2021-44686?
CVE-2021-44686 is a vulnerability with a CVSS score of 7.5 (HIGH). 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.
How severe is CVE-2021-44686?
CVE-2021-44686 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-44686?
Check the references section above for vendor advisories and patch information. Affected products include: Calibre-Ebook Calibre, Fedoraproject Fedora.