Same dubt. Should be caused using a buffer overflow style attack. Improbable but not impossible.
@nerd2ninja which client did you use (with version)?
I've asked Telegram to create a Security.md file in their Github repo so this can be reported. My current guess is that this may have been caused by an unquoted strings vulnerability.
To answer your question, Telegram for desktop on Windows.
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Telegram for desktop on Windows.
Version? Could be useful to alert other users if the bug in version specific.
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Not sure. I'm no longer near my computer. It should be the newest version though. I don't have a notification to update it or anything
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