What is CVE-2026-9986?

CVE-2026-9986 is a medium-severity vulnerability in Apple Macos, classified under Improper Input Validation. CVSS score: 4.2/10. Published 2026-05-28.

How severe is CVE-2026-9986?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Improper input validation in Apple Macos

CVE-2026-9986

Insufficient validation of untrusted input in OptimizationGuide in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to perform UI spoofing via a crafted HTML page. (Chromium security…

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

EPSS: 0.001 (24.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L.

Affected products

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

chrome-cve-admin@google.com (Vendor Advisory)
chrome-cve-admin@google.com (Permissions Required)

Frequently asked questions

What is CVE-2026-9986?: CVE-2026-9986 is a medium-severity vulnerability in Apple Macos, classified under Improper Input Validation. CVSS score: 4.2/10. Published 2026-05-28.
How severe is CVE-2026-9986?: Medium severity. CVSS v3 base score is 4.2 out of 10.