Published Oct 20, 2026Sources checked Nov 12, 2026
5.9MEDIUMCVSS out of 10
What this means
Review the available evidence
CVE-2026-86871 and is rated Medium severity with a CVSS score of 5.9. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.
CISA KEVNot listedBased on the latest collected catalog
EPSS0.5%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-86871?
An integer underflow was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7.
An attacker with control of a network file server may be able to cause unexpected system termination.