CVE-2026-39873

Published Jul 27, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title macOS SMB Server Crash Leading to Denial of Service
Type Values Removed Values Added
Title macOS SMB Server Crash Leading to Denial of Service
Weaknesses CWE-122
Type Values Removed Values Added
Title Malicious SMB Server Can Crash macOS via Improper Memory Handling
Type Values Removed Values Added
Title Malicious SMB Server Can Crash macOS via Improper Memory Handling
Weaknesses CWE-119
CWE-122
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Apple
Apple macos
Vendors & Products Apple
Apple macos
Type Values Removed Values Added
Description 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.
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apple
Published
Updated
Jul 28, 2026, 3:22 PM
Reserved
Apr 7, 2026, 7:58 PM
Status
Analyzed
Published
Jul 27, 2026, 9:16 PM
Modified
Oct 24, 2026, 1:10 PM