What is CVE-2026-84571?

CVE-2026-84571 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 4.3/10. Published 2026-09-14.

How severe is CVE-2026-84571?

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

Buffer overflow in Apple iOS And Ipados

CVE-2026-84571

A buffer overflow 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 2026-09-14 · last modified 2026-09-18.

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

EPSS: 0.004 (34.1th percentile), scored 2026-10-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

support.apple.com/en-us/149034 (Release Notes, Vendor Advisory)
support.apple.com/en-us/149035 (Release Notes, Vendor Advisory)
support.apple.com/en-us/149036 (Release Notes, Vendor Advisory)
support.apple.com/en-us/149037 (Release Notes, Vendor Advisory)
support.apple.com/en-us/149038 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-84571?: CVE-2026-84571 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 4.3/10. Published 2026-09-14.
How severe is CVE-2026-84571?: Medium severity. CVSS v3 base score is 4.3 out of 10.