What is CVE-2026-86918?

CVE-2026-86918 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Out-of-bounds Write. CVSS score: 4.3/10. Published 2026-10-20.

How severe is CVE-2026-86918?

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

Buffer overflow in Apple iOS And Ipados

CVE-2026-86918

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27, tvOS 27, visionOS 27, watchOS 27. Processing a maliciously crafted image may lead to unexpected app termination.

Vulnerability class: Buffer Overflow

Published 2026-10-20 · last modified 2026-10-20.

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:N/I:N/A:L.

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

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

Frequently asked questions

What is CVE-2026-86918?: CVE-2026-86918 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Out-of-bounds Write. CVSS score: 4.3/10. Published 2026-10-20.
How severe is CVE-2026-86918?: Medium severity. CVSS v3 base score is 4.3 out of 10.