What is CVE-2026-5279?

CVE-2026-5279 is a high-severity vulnerability in Apple macOS, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2026-04-01.

How severe is CVE-2026-5279?

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

Buffer overflow in Apple macOS

CVE-2026-5279

Object corruption in V8 in Google Chrome prior to 146.0.7680.178 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)

Vulnerability class: Buffer Overflow

Published 2026-04-01 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.004 (27.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.001

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

chromereleases.googleblog.com/2026/03/stable-channel-update-for-desktop_31.html (Vendor Advisory)
issues.chromium.org/issues/490642836 (Permissions Required, Issue Tracking)

Frequently asked questions

What is CVE-2026-5279?: CVE-2026-5279 is a high-severity vulnerability in Apple macOS, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2026-04-01.
How severe is CVE-2026-5279?: High severity. CVSS v3 base score is 8.8 out of 10.