Is CVE-2026-64691 being actively exploited?

CVE-2026-64691 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2026-64691?

CVE-2026-64691 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2026-64691

CRITICAL · CVSS 9.8EPSS 0.5%EU EUVD

A buffer overflow was addressed with improved size validation. This issue is fixed in macOS Tahoe 26.6. An app may be able to cause unexpected system termination.

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-120
EPSS score: 0.5% (39th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2026-49453)
Published: July 27, 2026
NVD last modified: July 28, 2026
Status: Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-49453 in the EU Vulnerability Database. Last updated in EUVD on July 28, 2026.

View on the EU Vulnerability Database

Affected products

apple / macos

Certified products that may be affected

2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Apple macOS 26 Tahoe: FileVault - Apple Inc. - Common Criteria CCEVS-VR-VID-11696-2026 - active
Apple macOS 26 Tahoe - Apple Inc. - Common Criteria CCEVS-VR-VID-11695-2026 - active

References

https://support.apple.com/en-us/128067(Release Notes, Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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