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CVE-2026-64691: An app may be able to cause unexpected system termination in Apple macOS

0
Critical
VulnerabilityCVE-2026-64691cvecve-2026-64691
Published: 07/27/2026 (07/27/2026, 20:14:52 UTC)
Source: CVE Database V5
Vendor/Project: Apple
Product: macOS

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 v3.1

Score 9.8critical

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected software

Apple

macOS

Affected versions
>=0 <26.6

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 07/29/2026, 23:47:45 UTC

Technical Analysis

This vulnerability involves a buffer overflow in Apple macOS that could be exploited by a malicious application to cause unexpected system termination. The flaw was mitigated by improved size validation checks. The fix is included in macOS Tahoe 26.6. The CVSS 3.1 base score is 9.8, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported. The vendor has not provided explicit remediation level or advisory content beyond the fix version.

Potential Impact

Successful exploitation could allow an attacker to cause a denial of service by triggering unexpected system termination. The vulnerability affects system stability and could potentially impact confidentiality and integrity due to the high CVSS impact metrics. No evidence of exploitation in the wild is currently known.

Mitigation Recommendations

A fix is available in macOS Tahoe 26.6. Users and administrators should update to macOS Tahoe 26.6 or later to remediate this vulnerability. Patch status beyond this fix version is not explicitly confirmed in vendor advisories; therefore, verifying with official Apple security updates is recommended.

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Technical Details

Data Version
5.2
Assigner Short Name
apple
Date Reserved
2026-07-20T18:09:01.158Z
State
PUBLISHED

Threat ID: 6a67c1be9c2644c7f8cb124b

Added to database: 07/27/2026, 20:38:22 UTC

Last enriched: 07/29/2026, 23:47:45 UTC

Last updated: 09/11/2026, 22:08:24 UTC

Views: 44

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