What is CVE-2026-86929?

CVE-2026-86929 is a high-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 8.8/10. Published 2026-10-26.

How severe is CVE-2026-86929?

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

Out-of-bounds Read in Apple macOS

CVE-2026-86929

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2. Processing a maliciously crafted file may lead to arbitrary code execution.

Vulnerability class: Buffer Overflow

Published 2026-10-26 · last modified 2026-10-26.

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

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Apple macOS

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

Frequently asked questions

What is CVE-2026-86929?: CVE-2026-86929 is a high-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 8.8/10. Published 2026-10-26.
How severe is CVE-2026-86929?: High severity. CVSS v3 base score is 8.8 out of 10.