ReDoS Vulnerability in Calibre by Kovid Goyal
CVE-2021-44686

7.5HIGH

Key Information:

Vendor

Calibre-ebook

Status
Calibre
Vendor
CVE Published:
7 December 2021

What is CVE-2021-44686?

Calibre prior to version 5.32.0 is susceptible to a Regular Expression Denial of Service (ReDoS) due to an inefficient regex pattern found in the html_preprocess_rules function. This could lead to performance degradation or denial of service during the processing of certain ebooks, as the flawed regex may cause excessive backtracking. Users are advised to upgrade to the latest version to mitigate this vulnerability.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

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Deploy the Patch

References

https://bugs.launchpad.net/calibre/+bug/1951979
x_refsource_MISC
https://github.com/dwisiswant0/advisory/issues/18
x_refsource_MISC
https://github.com/kovidgoyal/calibre/compare/v5.31.1...v...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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