Fpdf2: Exponential SVG '<use>' Expansion Causes CPU And Memory Exhaustion In 'FPDF.image()'

Summary fpdf2 expands SVG "" references by deep-copying the complete referenced graphics tree. A small SVG can use nested references to make the number of in-memory objects grow exponentially, causing excessive CPU and memory consumption during "FPDF.image" processing. This was reproduced with an...