well-designed software will quit out upon realizing that it's malformed. for instance, ffmpeg will tell you:
[ffmpeg/video] mjpeg: mjpeg: unsupported coding type (ca)
[ffmpeg/video] mjpeg: Can not process SOS before SOF, skipping
[ffmpeg/video] mjpeg: No JPEG data found in image
similarly, imagemagick will immediately reject it without causing any real harm.
php-gd is one example of a library that will balloon up to using an absurd amount of ram in an effort to decode it. it will eventually produce an "image" (the screenshot i posted above) but in the meantime, it might use enough memory to crash or freeze the machine that's handling it.
i imagine that other image libraries will have variable reactions to it. the way that chacha handled it, where it crashed the entire site for several minutes and then caused the image processing server to never properly recover, is probably the worst that i have ever seen.
browsers won't try to preview it at all, you will have to save it locally, but it is supposed to be 52kb
Removed by mod
didn't cause any damage but the preview is totally black, it just gives up entirely on trying to process it: https://i.imgur.com/lRuxH8T.png
so the full corrupted image is 20,000 x 36,909 but most of that space is filled with garbage data because it didn't finish encoding
here's what it looks like if i screenshot it: https://i.imgur.com/BB8VvBr.png
made a post about it: https://hexbear.net/post/90163
if anyone can get staff attention towards this too, that would be good. i am hoping this gets fixed soon
the staff told me to post one! the blood is off my hands