Doesn't affect my mobile client
this post was submitted on 10 Jul 2023
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If anything this is probably a vulnerability in a browser implementation (or one of the apps). I'd be surprised if Lemmy in and of itself is vulnerable to an attack via embedded JS in a picture.
No offense, but I think you're putting too much trust on the Lemmy code. I'm not saying the code is bad, but it's just as likely as other codes that the vulnerability is in Lemmy's code.
But lemmy itself shouldn't really interact with the images in terms of decoding them. Just having the code in the image may be weird but it should only affect code that actually tries to read and understand the bytes. Just passing it around shouldn't cause the code to be executed.
And the real decoding and displaying is hopefully done by the browsers Codebase, not by anything Lemmy does itself.
At least that's my line of reasoning. I may very well be off here.