What is CVE-2026-8560?

CVE-2026-8560 is a medium-severity vulnerability in Apple Iphone OS, classified under Heap-based Buffer Overflow. CVSS score: 4.3/10. Published 2026-05-14.

How severe is CVE-2026-8560?

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

Buffer overflow in Apple Iphone OS

CVE-2026-8560

Heap buffer overflow in SwiftShader in Google Chrome on Mac and iOS prior to 148.0.7778.168 allowed a remote attacker to perform an out of bounds memory read via a crafted HTML page. (Chromium security severity: Medium)

Vulnerability class: Buffer Overflow

Published 2026-05-14 · 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:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (15.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.8% 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: 0.003 · change: +0.000

Affected products

Apple Iphone OS
Apple macOS
Google Chrome — versions 148.0.7778.168

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html (Product, Vendor Advisory)
issues.chromium.org/issues/328109821 (Permissions Required)

Frequently asked questions

What is CVE-2026-8560?: CVE-2026-8560 is a medium-severity vulnerability in Apple Iphone OS, classified under Heap-based Buffer Overflow. CVSS score: 4.3/10. Published 2026-05-14.
How severe is CVE-2026-8560?: Medium severity. CVSS v3 base score is 4.3 out of 10.