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Signal users, please update to the latest version.
There are regular updates to address threats.
Just download the latest version. There aren't "patches" like you see for operating systems.
https://signal.org/download/
All supported platforms.
Note: if you are new to Signal,
To use the Signal desktop app, Signal must first be installed on your phone.
Cross-posted in Activist Headquarters.
On edit: here's what to do on Apple devices, in detail.
https://www.democraticunderground.com/?com=view_post&forum=1011&pid=4406
WIndows, Linux and android users; chime in. Not everyone is a computer expert.