What is CVE-2026-5273?

CVE-2026-5273 is a medium-severity vulnerability in Apple macOS, classified under Use After Free. CVSS score: 6.3/10. Published 2026-04-01.

How severe is CVE-2026-5273?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Use After Free in Apple macOS

CVE-2026-5273

Use after free in CSS 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: Use-After-Free

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

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (11.7th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 11.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.002 · change: -0.001

Affected products

Weakness classification (CWE)

CWE-416 — Use After Free

References

chromereleases.googleblog.com/2026/03/stable-channel-update-for-desktop_31.html (Vendor Advisory)
issues.chromium.org/issues/493952652 (Permissions Required, Issue Tracking)

Frequently asked questions

What is CVE-2026-5273?: CVE-2026-5273 is a medium-severity vulnerability in Apple macOS, classified under Use After Free. CVSS score: 6.3/10. Published 2026-04-01.
How severe is CVE-2026-5273?: Medium severity. CVSS v3 base score is 6.3 out of 10.