SVG is fundamentally different from other digital image formats. Where JPG and PNG combine thousands of colored pixels to create an image, SVG uses mathematical formulas to describe geometric shapes, lines and text. Basically, this vector nature makes it possible to obtain images perfectly adaptable to all screen resolutions, but it is ideal for any kind of hostile manipulation: XSS (Cross-Site Scripting), steganography (hiding messages or code), etc.
Very convenient for hackers because it will appear to the victim as a simple image file: an absolutely perfect attack surface! The MalwareHunterTeam research team whose work he forwards BleepingComputerdocumented a significant increase in attacks using this format.