CVE-2026-39873 — CRITICAL (9.8)

Q: How severe is CVE-2026-39873?

CVE-2026-39873 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2026-39873?

Check the references section above for vendor advisories and patch information. Affected products include: Apple Macos.

Vulnerability 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.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Apple	Macos	>= 14.0, < 14.8.8

Related Weaknesses (CWE)

CWE-119

References

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

FAQ

What is CVE-2026-39873?

CVE-2026-39873 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 s...

How severe is CVE-2026-39873?

CVE-2026-39873 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-39873?

Check the references section above for vendor advisories and patch information. Affected products include: Apple Macos.