What’s Vulnerable › Vulnerabilities

CVE-2026-20621

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-11 · updated 2026-06-17
• Weakness: CWE-119

Description

The issue was addressed with improved memory handling. This issue is fixed in iOS 18.7.5 and iPadOS 18.7.5, iOS 26.3 and iPadOS 26.3, macOS Sequoia 15.7.4, macOS Sonoma 14.8.4, macOS Tahoe 26.3, visionOS 26.3. An app may be able to cause unexpected system termination or corrupt kernel memory.

Affected products

• Apple iPadOS: before 26.3 — fixed in 26.3
• Apple Iphone Os: before 26.3 — fixed in 26.3
• Apple macOS: before 14.8.4; from 15.0 before 15.7.4; from 26.0 before 26.3 — fixed in 14.8.4, 15.7.4, 26.3

How to fix

Upgrade to a fixed version: Apple iPadOS 26.3; Apple Iphone Os 26.3; Apple macOS 14.8.4, 15.7.4, 26.3. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/126346
• https://support.apple.com/en-us/126347
• https://support.apple.com/en-us/126348
• https://support.apple.com/en-us/126349
• https://support.apple.com/en-us/126350
• https://support.apple.com/en-us/126353

Get alerted when CVE-2026-20621 or the next vulnerability affects your stack