What is CVE-2026-9942?

CVE-2026-9942 is a medium-severity vulnerability in Apple macOS, classified under CWE-457. CVSS score: 5.0/10. Published 2026-05-28.

How severe is CVE-2026-9942?

Medium severity. CVSS v3 base score is 5.0 out of 10.

Vulnerability in Apple macOS

CVE-2026-9942

Uninitialized Use in ANGLE in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: High)

Published 2026-05-28 · last modified 2026-07-21.

CVSS v3 metric

CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (13.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-457

References

chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/503438092 (Permissions Required)

Frequently asked questions

What is CVE-2026-9942?: CVE-2026-9942 is a medium-severity vulnerability in Apple macOS, classified under CWE-457. CVSS score: 5.0/10. Published 2026-05-28.
How severe is CVE-2026-9942?: Medium severity. CVSS v3 base score is 5.0 out of 10.