High severity7.5NVD Advisory· Published Dec 7, 2021· Updated Jun 17, 2026
CVE-2021-44686
CVE-2021-44686
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
6<5.32.0+ 1 more
- (no CPE)range: <5.32.0
- cpe:2.3:a:calibre-ebook:calibre:*:*:*:*:*:*:*:*range: <5.32.0
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
5- github.com/kovidgoyal/calibre/compare/v5.31.1...v5.32.0nvdPatchThird Party Advisory
- bugs.launchpad.net/calibre/+bug/1951979nvdExploitIssue TrackingVendor Advisory
- github.com/dwisiswant0/advisory/issues/18nvdExploitIssue TrackingPatchThird Party Advisory
- lists.debian.org/debian-lts-announce/2024/09/msg00005.htmlnvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W7QKFPYJ23KG6WJ5NIYAM4N2NWZCLQGL/nvd
News mentions
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