Improper input validation in macOS - CVE-2026-43706

Vulnerability identifier: #VU137084

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-43706

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in libxslt when parsing input. A remote attacker can send specially crafted input to cause a denial of service.

macOS
visionOS
tvOS
Apple iOS
iPadOS
watchOS

Install update from vendor's website.

macOS - addressed in versions 26.5.2 25F84, 14.8.8 23J620, 15.7.8 24G824
visionOS - update to 26.6
tvOS - update to 26.6 23L773
Apple iOS - update to 26.5.2 23F84
iPadOS - update to 26.5.2 23F84
watchOS - update to 26.6 23U67

• https://support.apple.com/en-us/127595

• Multiple vulnerabilities in Apple macOS Tahoe
• Multiple vulnerabilities in macOS Sequoia
• Multiple vulnerabilities in macOS Sonoma
• Multiple vulnerabilities in Apple visionOS
• Multiple vulnerabilities in Apple tvOS
• Multiple vulnerabilities in Apple watchOS
• Multiple vulnerabilities in iOS 26 and iPadOS 26