Memory Handling Vulnerability in Apple's macOS Products
CVE-2026-39873

9.8CRITICAL

Key Information:

Vendor

Apple
Status
Mac OS
Vendor
CVE Published:
27 July 2026

What is CVE-2026-39873?

A memory handling flaw exists within Apple's macOS products that can be exploited when connecting to a malicious SMB server. This vulnerability may cause unexpected system terminations, disrupting user experience and system stability. Apple has addressed this issue in the latest updates for macOS Sequoia, Sonoma, and Tahoe. Users are encouraged to update their systems to mitigate any risks associated with this vulnerability.

Affected Version(s)

macOS 0 < 14.8.8

macOS 0 < 15.7.8

macOS 0 < 26.6

References

https://support.apple.com/en-us/128067
https://support.apple.com/en-us/128071
https://support.apple.com/en-us/128072

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.