What is CVE-2025-9479?

CVE-2025-9479 is a medium-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 4.3/10. Published 2025-11-14.

How severe is CVE-2025-9479?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Out-of-bounds Read in Apple macOS

CVE-2025-9479

Out of bounds read in V8 in Google Chrome prior to 133.0.6943.141 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: Medium)

Vulnerability class: Buffer Overflow

Published 2025-11-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.002 (8.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.3% 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-125 — Out-of-bounds Read

References

chromereleases.googleblog.com/2025/02/stable-channel-update-for-desktop_25.html (Vendor Advisory)
issues.chromium.org/issues/390743124 (Exploit, Issue Tracking)

Frequently asked questions

What is CVE-2025-9479?: CVE-2025-9479 is a medium-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 4.3/10. Published 2025-11-14.
How severe is CVE-2025-9479?: Medium severity. CVSS v3 base score is 4.3 out of 10.