Apple Security Advisory 2019-10-29-2 - macOS Catalina 10.15.1, Security Update 2019-001 Mojave, Security Update 2019-006 High Sierra are now available and address code execution and denial of service vulnerabilities.
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Apple Security Advisory 2019-10-29-10 - macOS Catalina 10.15 addresses buffer overflow, code execution, cross site scripting, denial of service, and resource exhaustion vulnerabilities.
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Apple Security Advisory 2019-10-29-6 - iOS 13 addresses buffer overflow, code execution, cross site scripting, and denial of service vulnerabilities.
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