CVE-2025-64486

9.3 criticalEPSS 0.2%

Critical (9.3). EPSS 0.2% chance of exploitation in the next 30 days.

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

CVSS 4.0

9.3 critical

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

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 8% of CVEs (scores of 2026-11-01)
CWE: CWE-73
Published: 2025-11-08
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

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

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