About Apple security updates
For our customers' protection, Apple doesn't disclose, discuss or confirm security issues until an investigation has taken place and patches or releases are available. Recent releases are listed on the Apple security updates page.
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Released 26 January 2021
Available for: macOS Catalina 10.15.4 and later
Impact: A malicious application may be able to access arbitrary files on the host device while running an app that uses on-demand resources with Xcode
Description: a path handling issue was addressed with improved validation.
CVE-2021-1800: Theodore Dubois (@tblodt)