A security vulnerability in WhatsApp could allow an attacker to read sensitive information from the app. The vulnerability is in a function called AndroidBitmap in the apps apply filter that can be used to change the color, tone, and more of a photo. The problem is that both the source and destination images are assumed to have the same dimensions and also the same-format RGBA (meaning each pixel is stored as four), but there are no checks performed on the image.”]
Source: https://threatpost.com/whatsapp-photo-filter-bug-allows-sensitive-info-to-be-lifted/169141/