How severe is CVE-2025-64486?

CVE-2025-64486 has a CVSS 4.0 base score of 9.3, rated critical severity.

Is CVE-2025-64486 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-64486?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-64486 have an EU (EUVD) identifier?

Yes. CVE-2025-64486 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-38333.

When was CVE-2025-64486 published?

CVE-2025-64486 was published on 2025-11-08 and last updated on 2026-06-17.

CVE-2025-64486

CVE-2025-64486 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-73.

Key facts

Severity: Critical (CVSS 4.0 base score 9.3)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-38333
Weakness: CWE-73
Published: 2025-11-08
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-64486?: 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.
How severe is CVE-2025-64486?: CVE-2025-64486 has a CVSS 4.0 base score of 9.3, rated critical severity.
Is CVE-2025-64486 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-64486?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-64486 have an EU (EUVD) identifier?: Yes. CVE-2025-64486 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-38333.
When was CVE-2025-64486 published?: CVE-2025-64486 was published on 2025-11-08 and last updated on 2026-06-17.

References

Other CWE-73 vulnerabilities

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CVE-2025-71334 — Critical (CVSS 9.8): Flowise before 3.0.6 (affected versions 2.2.8 and earlier) contains an arbitrary file access vulnerability due to…
CVE-2025-71333 — Critical (CVSS 9.8): Flowise through 2.2.4 contains an unauthenticated arbitrary file upload vulnerability in the /api/v1/attachments…
CVE-2026-39006 — Critical (CVSS 9.8): An issue in SNMP4J-Agent 3.8.3 allows a remote attacker to execute arbitrary code via the snmp4jCfgStoragePath…

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