CVE-2025-64486

calibre is vulnerable to arbitrary code execution when opening FB2 files

CVSS 9.3 CRITICALEPSS 0.2%CWE-73

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.3EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

07 Nov 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Affected products

kovidgoyal · calibre

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References

https://github.com/kovidgoyal/calibre/commit/6f94bce214bf7d43c829804db3741afa5e83c0c5 https://github.com/kovidgoyal/calibre/security/advisories/GHSA-hpwq-c98h-xp8g