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.
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Swift 5.1.1 for Ubuntu
Released 11 October 2019
Available for: Ubuntu 14.04, 16.04 and 18.04
Impact: Incorrect management of file descriptors in URLSession could lead to inadvertent data disclosure
Description: This issue was addressed by updating incorrect URLSession file descriptors management logic to match Swift 5.0.