CVE-2026-39873
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Apple Macos
PublishedJul 27, 2026
First seenJul 27, 2026
Weakness typeCWE-119Memory buffer bounds error
How to fix
Update
- apple macos14.8.8, 15.7.8, 26.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| apple macos | 14.0 ≤ v < 14.8.8, 15.0 ≤ v < 15.7.8, 26.0 ≤ v < 26.6 | 14.8.8, 15.7.8, 26.6 |
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