CVE-2026-39873

The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. Connecting to a malicious SMB server may lead to unexpected system termination.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://support.apple.com/en-us/128067	Release Notes Vendor Advisory
https://support.apple.com/en-us/128071	Release Notes Vendor Advisory
https://support.apple.com/en-us/128072	Release Notes Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:apple:macos::::::::
	cpe:2.3:o:apple:macos::::::::
	cpe:2.3:o:apple:macos::::::::

History

28 Jul 2026, 19:53

Type	Values Removed	Values Added
References	~~() https://support.apple.com/en-us/128067 -~~	() https://support.apple.com/en-us/128067 - Release Notes, Vendor Advisory
References	~~() https://support.apple.com/en-us/128071 -~~	() https://support.apple.com/en-us/128071 - Release Notes, Vendor Advisory
References	~~() https://support.apple.com/en-us/128072 -~~	() https://support.apple.com/en-us/128072 - Release Notes, Vendor Advisory
First Time		Apple Apple macos
CPE		cpe:2.3:o:apple:macos::::::::

28 Jul 2026, 16:17

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.8
CWE		CWE-119

27 Jul 2026, 21:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-27 21:16

Updated : 2026-07-28 19:53

NVD link : CVE-2026-39873

Mitre link : CVE-2026-39873

CVE.ORG link : CVE-2026-39873

JSON object : View

Products Affected

apple

macos

CWE

CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

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