What is CVE-2025-9478?

CVE-2025-9478 is a high-severity vulnerability in Apple macOS, classified under Use After Free. CVSS score: 8.8/10. Published 2025-08-26.

How severe is CVE-2025-9478?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2025-9478 known to be exploited?

5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Use After Free in Apple macOS

CVE-2025-9478

Use after free in ANGLE in Google Chrome prior to 139.0.7258.154 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: Critical)

Vulnerability class: Use-After-Free

EPSS: 0.035 (87.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CWE-416 — Use After Free

Public proof-of-concept exploits

References

chrome-cve-admin@google.com (Release Notes, Vendor Advisory)
chrome-cve-admin@google.com (Permissions Required, Issue Tracking)

Frequently asked questions

What is CVE-2025-9478?: CVE-2025-9478 is a high-severity vulnerability in Apple macOS, classified under Use After Free. CVSS score: 8.8/10. Published 2025-08-26.
How severe is CVE-2025-9478?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2025-9478 known to be exploited?: 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.