What is CVE-2026-84531?

CVE-2026-84531 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Out-of-bounds Write. CVSS score: 6.2/10. Published 2026-09-14.

How severe is CVE-2026-84531?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Buffer overflow in Apple iOS And Ipados

CVE-2026-84531

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. Processing maliciously crafted NTLM input 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 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.001 (4.1th percentile), scored 2026-10-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

support.apple.com/en-us/149034 (Vendor Advisory)
support.apple.com/en-us/149035 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-84531?: CVE-2026-84531 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Out-of-bounds Write. CVSS score: 6.2/10. Published 2026-09-14.
How severe is CVE-2026-84531?: Medium severity. CVSS v3 base score is 6.2 out of 10.