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% (8th 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% (8th 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% (8th 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

CVE-2026-20358 — Critical (CVSS 10.0): As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Crosswork engineering team…
CVE-2026-50148 — Critical (CVSS 10.0): Metabase is an open-source business intelligence and embedded analytics tool. From 1.54.0 until 1.54.24, 1.55.24,…
CVE-2025-71338 — Critical (CVSS 10.0): Flowise contains a path traversal vulnerability in the /api/v1/document-store/loader/process endpoint that allows…
CVE-2026-39907 — Critical (CVSS 10.0): Unisys WebPerfect Image Suite versions 3.0.3960.22810 and 3.0.3960.22604 expose an unauthenticated WCF SOAP endpoint on…
CVE-2026-27211 — Critical (CVSS 10.0): Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. Versions 34.0 through 50.0 arevulnerable to…
CVE-2026-63343 — Critical (CVSS 9.9): Incus is a system container and virtual machine manager. Prior to version 7.3.0, a malicious image containing a…

Browse all CWE-73 vulnerabilities →