What is CVE-2025-43366?

CVE-2025-43366 is a medium-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2025-09-15.

How severe is CVE-2025-43366?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Out-of-bounds Read in Apple macOS

CVE-2025-43366

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Tahoe 26. An app may be able to disclose coprocessor memory.

Vulnerability class: Buffer Overflow

EPSS: 0.002 (9.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Apple Macos — versions 0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

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

What is CVE-2025-43366?: CVE-2025-43366 is a medium-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2025-09-15.
How severe is CVE-2025-43366?: Medium severity. CVSS v3 base score is 5.5 out of 10.