What’s Vulnerable › Vulnerabilities

CVE-2026-86881

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-10-26
• Weakness: CWE-295

Description

A certificate validation issue was addressed with improved certificate validation. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, watchOS 27. An attacker with a compromised intermediate certificate authority may be able to issue certificates with arbitrary extended key usages.

Affected products

• Apple iPadOS: before 26.7 — fixed in 26.7
• Apple Iphone Os: before 26.7 — fixed in 26.7
• Apple macOS: from 15.0 before 15.8; from 26.0 before 26.7 — fixed in 15.8, 26.7
• Apple tvOS: before 27.0 — fixed in 27.0
• Apple visionOS: before 27.0 — fixed in 27.0
• Apple watchOS: before 27.0 — fixed in 27.0
• Apple iOS and iPadOS: before 26.7; before 27 — fixed in 26.7, 27
• Apple macOS: before 15.8; before 26.7; before 27 — fixed in 15.8, 26.7, 27
• Apple tvOS: before 27 — fixed in 27
• Apple visionOS: before 27 — fixed in 27
• Apple watchOS: before 27 — fixed in 27

How to fix

Upgrade to a fixed version: Apple iPadOS 26.7; Apple Iphone Os 26.7; Apple macOS 15.8, 26.7; Apple tvOS 27.0; Apple visionOS 27.0; Apple watchOS 27.0; Apple iOS and iPadOS 26.7, 27; Apple macOS 15.8, 26.7, 27; Apple tvOS 27; Apple visionOS 27; Apple watchOS 27. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/149034
• https://support.apple.com/en-us/149035
• https://support.apple.com/en-us/149036
• https://support.apple.com/en-us/149037
• https://support.apple.com/en-us/149038
• https://support.apple.com/en-us/149041
• https://support.apple.com/en-us/149042
• https://support.apple.com/en-us/149043

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