What is the CVSS score of CVE-2026-39873?

CVE-2026-39873 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Is there a patch available for CVE-2026-39873?

Yes, a patch is available for CVE-2026-39873. Update the affected software to the latest version immediately.

Apple CVE-2026-39873

EUVD-2026-49459 CRITICAL

Buffer Overflow (CWE-119)

2026-07-27 apple

GHSA-2pcr-98qw-8jgc

Buffer Overflow Apple

9.8

CVSS 3.1 · Vendor: apple

Severity by source

Vendor (apple) PRIMARY

9.8 CRITICAL

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

Primary rating from Vendor (apple) · only source for this CVE.

CVSS VectorVendor: apple

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Jul 28, 2026 - 16:23 vuln.today

CVSS changed

Jul 28, 2026 - 16:22 NVD

9.8 (CRITICAL)

Patch available

Jul 27, 2026 - 21:17 EUVD

CVE Published

Jul 27, 2026 - 20:14 cve.org

CRITICAL 9.8

CVE Published

Jul 27, 2026 - 20:14 cve.org

UNKNOWN (no severity yet)

DescriptionCVE.org

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.

AnalysisAI

Connecting to a malicious SMB server can cause unexpected system termination in macOS due to a memory handling vulnerability (CWE-119). The issue affects all macOS versions prior to Sequoia 15.7.8, Sonoma 14.8.8, and Tahoe 26.6 and has been addressed with improved memory handling. No known active exploitation or public exploit code exists, and the EPSS probability of exploitation is very low (0.15%).