Input validation error in Calibre - CVE-2025-64486
Published: November 28, 2025
Vulnerability identifier: #VU118842
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-64486
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to the application does not validate filenames when handling binary assets in FB2 files. A remote attacker can trick the victim into converting a malicious FictionBook file and write files to arbitrary locations on the system, leading to system compromise.
Affected software
Calibre
Fedora
calibre
Fedora
calibre
How to mitigate CVE-2025-64486
Install updates from vendor's website.
Calibre - update to 8.14.0
calibre - update to 8.14.0-1.fc43
calibre - update to 8.14.0-1.fc43