7.8
High
CVE-2026-20700 Apple Multiple Buffer Overflow Vulnerability
Active exploitation observed
· CISA KEV catalogue
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Ransomware campaigns
Not observed so far
Weakness
CWE-119
Description
A memory corruption issue was addressed with improved state management. This issue is fixed in iOS 26.3 and iPadOS 26.3, macOS Tahoe 26.3, tvOS 26.3, visionOS 26.3, watchOS 26.3. An attacker with memory write capability may be able to execute arbitrary code. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals on versions of iOS before iOS 26. CVE-2025-14174 and CVE-2025-43529 were also issued in response to this report.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| macOS 26.3 | earliest → < 26.3 | 26.3 |
| watchOS 26.3 | earliest → < 26.3 | 26.3 |
| visionOS 26.3 | earliest → < 26.3 | 26.3 |
| iOS and iPadOS 26.3 | earliest → < 26.3 | 26.3 |
| tvOS 26.3 | earliest → < 26.3 | 26.3 |
Other CVEs of macOS
The 3813 CVEs of macOS →
CVE-2026-86925
An authorization issue was addressed with improved state management
5.5
Medium
CVE-2026-84627
A buffer overflow was addressed with improved bounds checking
7.8
High
CVE-2026-113945
An out-of-bounds read was addressed with improved bounds checking
5.5
Medium
CVE-2026-65327
A logic issue was addressed with improved checks
8.4
High