CVE-2026-86871

State: Published
Severity: 5.9 Medium
Published: Oct 20, 2026
Updated: Oct 26, 2026
Reserved: Sep 8, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-190 Integer Overflow or Wraparound
CWE-20 Improper Input Validation

Affected Products

Product	Versions
macOSApple	before 15.8Affected before 26.7Affected before 27Affected

References

https://support.apple.com/en-us/149035
https://support.apple.com/en-us/149042
https://support.apple.com/en-us/149043

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