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CVE-2025-64486

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Date: November 7, 2025

calibre is an e-book manager. In versions 8.13.0 and prior, calibre does not validate filenames when handling binary assets in FB2 files, allowing an attacker to write arbitrary files on the filesystem when viewing or converting a malicious FictionBook file. This can be leveraged to achieve arbitrary code execution. This issue is fixed in version 8.14.0.

Severity Score

Related Resources (4)

https://github.com/kovidgoyal/calibre/commit/6f94bce214bf7d43c829804db3741afa5e83c0c5
https://github.com/kovidgoyal/calibre/security/advisories/GHSA-hpwq-c98h-xp8g
https://nvd.nist.gov/vuln/detail/CVE-2025-64486
https://www.mend.io/vulnerability-database/CVE-2025-64486

Severity Score

Weakness Type (CWE)

External Control of File Name or Path

CWE-73

Top Fix

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Upgrade Version

Upgrade to version https://github.com/kovidgoyal/calibre.git - v8.14.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

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