Critical 9.3Published Nov 7, 2025

CVE-2025-64486calibre is vulnerable to arbitrary code execution when opening FB2 files

Updated under an hour ago (Oct 27, 2026, 12:50 PM ET)

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It affects kovidgoyal calibre. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for kovidgoyal calibre

Exploited in the last 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.

CVSS: 9.3 CRITICAL (v4.0, CNA)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
Weakness (CWE): CWE-73
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Nov 13, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

kovidgoyal calibre kovidgoyal:calibre (from the name)	before 8.14.0	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.