CVE-2021-44686
HIGH
7.5
CVSS Score
Published: December 6, 2021 at 11:41 PM UTC
Updated: June 17, 2026 at 04:12 AM UTC
2 products affected across 2 vendorsFedoraCalibre
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Severity
HIGH7.5
Exploit prediction
EPSS 5%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 5.32.0
Affected range stops below 5.32.0, so it looks safe — our inference, not a vendor statement
95%
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (5)
x_refsource_MISCExploitIssue TrackingVendor Advisory
Source: [email protected]
https://bugs.launchpad.net/calibre/+bug/1951979x_refsource_MISCExploitIssue TrackingPatchThird Party Advisory
Source: [email protected]
https://github.com/dwisiswant0/advisory/issues/18x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/kovidgoyal/calibre/compare/v5.31.1...v5.32.0Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W7QKFPYJ23KG6WJ5NIYAM4N2NWZCLQGL/Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2024/09/msg00005.htmlCVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-400
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