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CVE-2026-39873

Apple macOS buffer overflow

9.8 CRITICALEPSS 0.58%
  1. Published27 Jul 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Apple macOS≥ 14.0 < 14.8.8 · ≥ 15.0 < 15.7.8 · ≥ 26.0 < 26.6

Remediation

Fixed in
Apple macOS≥ 14.8.8

References

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Frequently asked

Is CVE-2026-39873 being actively exploited?

CVE-2026-39873 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.58%.

How severe is CVE-2026-39873?

CVE-2026-39873 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.58% probability of exploitation.

Which products are affected by CVE-2026-39873?

Affected products include Apple macOS.

How do I fix CVE-2026-39873?

Upgrade affected software to a fixed version, for example Apple macOS 14.8.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39873 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.