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Vulnerability record · CVE-2026-64691 · published 27 July 2026

CVE-2026-64691: Apple macos classic buffer overflow vulnerability

Apple · Macos

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.

9.8 CVSS 3.1 Critical EPSS 0.47% · top 62.0% CWE-120 · Classic buffer overflow
9.8CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
28 Jul 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://support.apple.com/en-us/128067 Release NotesVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-64691), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.