What’s Vulnerable › Vulnerabilities

CVE-2026-43666

• Severity: medium (CVSS 6.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-11 · updated 2026-10-26
• Weakness: CWE-787

Description

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.

Affected products

• Apple iPadOS: before 18.7.9; from 26.0 before 26.5 — fixed in 18.7.9, 26.5
• Apple Iphone Os: before 18.7.9; from 26.0 before 26.5 — fixed in 18.7.9, 26.5
• Apple macOS: from 14.0 before 14.8.7; from 15.0 before 15.7.7; from 26.0 before 26.5 — fixed in 14.8.7, 15.7.7, 26.5
• Apple tvOS: before 26.5 — fixed in 26.5
• Apple visionOS: before 26.5 — fixed in 26.5
• Apple watchOS: before 26.5 — fixed in 26.5

How to fix

Upgrade to a fixed version: Apple iPadOS 18.7.9, 26.5; Apple Iphone Os 18.7.9, 26.5; Apple macOS 14.8.7, 15.7.7, 26.5; Apple tvOS 26.5; Apple visionOS 26.5; Apple watchOS 26.5. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/127110
• https://support.apple.com/en-us/127111
• https://support.apple.com/en-us/127115
• https://support.apple.com/en-us/127116
• https://support.apple.com/en-us/127117
• https://support.apple.com/en-us/127118
• https://support.apple.com/en-us/127119
• https://support.apple.com/en-us/127120

Get alerted when CVE-2026-43666 or the next vulnerability affects your stack