[bcg361]

Telegram isn't as private as iMessage, but that doesn't mean it's not as secure. Security-wise, exploiting iMessage is easier than exploiting telegram, since iMessages has some special privileged access. Security doesn't mean privacy.

[scarface_74]

The issue with parsing images in a process was fixed awhile back. If you are really paranoid, you can put your iPhone in “lockdown mode”.

https://support.apple.com/en-us/105120