I'm a bit skeptical as the original article lacks any details or proof by what exploit code execution would be possible somehow embedded in images. Such a vulnerability would have a very high score as it seems to allow remote code execution without user interaction.
So what vulnerability is exploited in the context of WhatsApp? I mean there have been severe vulnerabilities in media or image frameworks, but not even a tiny explanation is provided in the article. I'm sorry but as it is, it's kinda click-bait. The article blabbers with steganography and embedding malicious code with it in images.
Now, why would WhatsApp decode steganography hidden stuff from such images? C'mon, seriously? Who believes this crap?