About Apple security updates
For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security updates page.
Apple security documents reference vulnerabilities by CVE-ID when possible.
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SwiftNIO SSL 2.4.1
Released October 4, 2019
Available for: SwiftNIO SSL 2.0.0 through 2.4.0 on Ubuntu 14.04 and later
Impact: A SwiftNIO application using TLS may be able to execute arbitrary code
Description: The issue was addressed by signaling that an executable stack is not required.