Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-favj-1bjh-9uff
Vulnerability ID VCID-favj-1bjh-9uff
Aliases 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.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk None
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2021-44686
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2021-44686
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2021-44686
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2021-44686
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2021-44686
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2021-44686
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2021-44686
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2021-44686
epss 0.00412 https://api.first.org/data/v1/epss?cve=CVE-2021-44686
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-44686
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44686
No exploits are available.
There are no known vectors.
Exploit Prediction Scoring System (EPSS)
Percentile 0.61347
EPSS Score 0.00412
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T16:35:09.939110+00:00 Debian Oval Importer Import https://www.debian.org/security/oval/oval-definitions-bullseye.xml.bz2 38.0.0