{"action":"Upgrade calibre to 5.33.0+dfsg-1 or later.","affected":[{"fixed":"5.33.0+dfsg-1","introduced":"0"}],"component":"calibre","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["5.33.0+dfsg-1"],"id":"tcs_01M5NG2A14K5G9G47TMJGPTH0V","modified_at":"2026-10-23T18:04:17.074986326Z","published_at":"2021-12-07T00:15:08.087Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-44686","https://security-tracker.debian.org/tracker/CVE-2021-44686"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-44686","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-44686"}],"summary":"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."}