CVE-2025-64486
Critical
Description
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.
SeverityCritical
CVSS9.3
Exploit probability—
ProductKovidgoyal Calibre
PublishedNov 8, 2025
First seenNov 8, 2025
Weakness typeCWE-73CWE-73
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| kovidgoyal calibre | < 8.14.0 | — |
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