What is CVE-2026-43656?

CVE-2026-43656 is a high-severity vulnerability in Apple iOS And Ipados, classified under Out-of-bounds Write. CVSS score: 7.3/10. Published 2026-05-11.

How severe is CVE-2026-43656?

High severity. CVSS v3 base score is 7.3 out of 10.

Buffer overflow in Apple iOS And Ipados

CVE-2026-43656

An out-of-bounds write issue was addressed with improved input validation. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5. Parsing a maliciously crafted file may lead to an unexpected app termination.

Vulnerability class: Buffer Overflow

Published 2026-05-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (30.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

support.apple.com/en-us/127110 (Release Notes, Vendor Advisory)
support.apple.com/en-us/127111 (Release Notes, Vendor Advisory)
support.apple.com/en-us/127115 (Release Notes, Vendor Advisory)
support.apple.com/en-us/127116 (Release Notes, Vendor Advisory)
support.apple.com/en-us/127117 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-43656?: CVE-2026-43656 is a high-severity vulnerability in Apple iOS And Ipados, classified under Out-of-bounds Write. CVSS score: 7.3/10. Published 2026-05-11.
How severe is CVE-2026-43656?: High severity. CVSS v3 base score is 7.3 out of 10.