Buffer overflow in Apple iOS And Ipados
CVE-2026-43666
An out-of-bounds write issue was addressed with improved bounds checking. 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, tvOS 26.5, visionOS 26.5, watchOS 26.5. An attacker on the local network may be able to cause a denial-of-service.
Vulnerability class: Buffer Overflow
Published · last modified .
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: 0.002 (6.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.8% 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: 0.002 · change: +0.000
Affected products
- Apple iOS And Ipados — versions 0
- Apple Ipados
- Apple Iphone OS
- Apple macOS — versions 0
- Apple tvOS — versions 0
- Apple Visionos — versions 0
- Apple watchOS — versions 0
Weakness classification (CWE)
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)
- support.apple.com/en-us/127118 (Release Notes, Vendor Advisory)
- support.apple.com/en-us/127119 (Release Notes, Vendor Advisory)
- support.apple.com/en-us/127120 (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-43666?
- CVE-2026-43666 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Out-of-bounds Write. CVSS score: 6.2/10. Published 2026-05-11.
- How severe is CVE-2026-43666?
- Medium severity. CVSS v3 base score is 6.2 out of 10.