Critical severity9.8NVD Advisory· Published Jul 27, 2026· Updated Jul 28, 2026
CVE-2026-39873
CVE-2026-39873
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.
Affected products
4- Range: 14.8.8
- Range: 15.7.8
- Range: 26.6
Patches
Vulnerability mechanics
References
3- support.apple.com/en-us/128067nvdRelease NotesVendor Advisory
- support.apple.com/en-us/128071nvdRelease NotesVendor Advisory
- support.apple.com/en-us/128072nvdRelease NotesVendor Advisory
News mentions
4- Apple Patches Everything (July 2026), (Wed, Jul 29th)SANS Internet Storm Center · Jul 29, 2026
- Apple Releases 25 macOS Security Patches, Including CUPS Privilege Escalation FlawVypr Intelligence · Jul 27, 2026
- Apple Patches 25 macOS Vulnerabilities in Single July 2026 DisclosureVypr Intelligence · Jul 27, 2026
- macOS Tahoe: 25 Security Flaws Patched in Single July 2026 DisclosureVypr Intelligence · Jul 27, 2026