CVE-2026-20687

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-25 · updated 2026-10-26
Weakness: CWE-416

Description

A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Sequoia 15.7.5, macOS Tahoe 26.4, tvOS 26.4, watchOS 26.4. An app may be able to cause unexpected system termination or write kernel memory.

Affected products

Apple iPadOS: before 18.7.7; from 26.0 before 26.4 — fixed in 18.7.7, 26.4
Apple Iphone Os: before 18.7.7; from 26.0 before 26.4 — fixed in 18.7.7, 26.4
Apple macOS: from 15.0 before 15.7.5; from 26.0 before 26.4 — fixed in 15.7.5, 26.4
Apple tvOS: before 26.4 — fixed in 26.4
Apple watchOS: before 26.4 — fixed in 26.4
Apple iOS and iPadOS: before 18.7.7; before 26.4 — fixed in 18.7.7, 26.4
Apple macOS: before 15.7.5; before 26.4 — fixed in 15.7.5, 26.4
Apple tvOS: before 26.4 — fixed in 26.4
Apple watchOS: before 26.4 — fixed in 26.4

How to fix

Upgrade to a fixed version: Apple iPadOS 18.7.7, 26.4; Apple Iphone Os 18.7.7, 26.4; Apple macOS 15.7.5, 26.4; Apple tvOS 26.4; Apple watchOS 26.4; Apple iOS and iPadOS 18.7.7, 26.4; Apple macOS 15.7.5, 26.4; Apple tvOS 26.4; Apple watchOS 26.4. Check the vendor advisory for mitigations.

References

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