What is CVE-2026-84538?

CVE-2026-84538 is a medium-severity vulnerability in Apple macOS, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-09-14.

How severe is CVE-2026-84538?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Apple macOS

CVE-2026-84538

A denial-of-service issue was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. A remote attacker may be able to cause a denial-of-service.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Apple Macos

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-84538?: CVE-2026-84538 is a medium-severity vulnerability in Apple macOS, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-09-14.
How severe is CVE-2026-84538?: Medium severity. CVSS v3 base score is 6.5 out of 10.