Path Traversal Vulnerability in Calibre eBook Manager
CVE-2026-25636

8.2HIGH

Key Information:

Vendor

Kovidgoyal

Status
Calibre
Vendor
CVE Published:
6 February 2026

What is CVE-2026-25636?

Calibre, a popular eBook management application, contains a path traversal vulnerability in its EPUB conversion feature. In versions 9.1.0 and earlier, a specially crafted malicious EPUB file can exploit this vulnerability, allowing attackers to corrupt arbitrary files within the writable directories of the Calibre process. The vulnerability arises when Calibre incorrectly resolves the CipherReference URI from the META-INF/encryption.xml file, leading it to access files outside the designated conversion extraction directory in read-write mode. This issue has been addressed in the subsequent release, version 9.2.0.

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Affected Version(s)

calibre < 9.2.0

References

https://github.com/kovidgoyal/calibre/security/advisories...
x_refsource_CONFIRM
https://github.com/kovidgoyal/calibre/commit/9484ea82c6ab...
x_refsource_MISC

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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