CVE-2026-20700: high-severity vulnerability in Apple macOS
Published · Updated
71Vexday Risk Score
Prioritize patching. It under exploitation confirmed by CISA and has a public proof of concept.
ssvc Actcvss 7.8epss 1.4%
from disclosure to weapon101 days
Published on NVDFeb 11
1st PoC+101d
CISA KEV+1d
exploitation probability
1.4%top 28% of all CVEs
observed exploitation
yesCISA + VulnCheck
3 public exploit(s)
Action required by CISAfederal deadline: 2026-03-05
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
In short
A memory corruption flaw in Apple operating systems (iOS, macOS, tvOS, visionOS, watchOS) could allow an attacker with the ability to write to system memory to run malicious code. This vulnerability has reportedly been exploited in real attacks.
Technical detail
CWE-119 buffer overflow in memory management across multiple Apple platforms. An attacker with memory write capability can trigger arbitrary code execution through improper state management. Fixed in iOS 26.3, iPadOS 26.3, macOS Tahoe 26.3, tvOS 26.3, visionOS 26.3, and watchOS 26.3.
Summary generated and translated by AI from the official 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.