What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-08 · updated 2026-06-17
• Weakness: CWE-73

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.

Affected products

• kovidgoyal calibre: before 8.14.0

References

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

Get alerted when CVE-2025-64486 or the next vulnerability affects your stack