What is CVE-2026-39870?

CVE-2026-39870 is a high-severity vulnerability in Apple Macos, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2026-05-11.

How severe is CVE-2026-39870?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Apple Macos

CVE-2026-39870

The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5. Processing a maliciously crafted image may corrupt process memory.

Vulnerability class: Buffer Overflow

EPSS: 0.000 (12.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Apple Macos — versions 0

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-39870?: CVE-2026-39870 is a high-severity vulnerability in Apple Macos, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2026-05-11.
How severe is CVE-2026-39870?: High severity. CVSS v3 base score is 7.5 out of 10.