CVE-2026-96640

The Pillow Python imaging library versions 5.1.0 through 13.0.0 are vulnerable to a resource exhaustion issue in the PdfParser.linearize_page_tree() function located in src/PIL/PdfParser.py . The root cause is that the parser treats a PDF /Pages graph as a tree without tracking duplicate indirect...

CVE-2026-96640 Pillow PDF append accepts malformed shared page-tree DAG causing resource exhaustion

Pillow is a Python imaging library. From 5.1.0 until 13.0.0, PdfParser.linearizepagetree in src/PIL/PdfParser.py treats a PDF /Pages graph as a tree without tracking duplicate indirect references. When Image.save..., format="PDF", append=True processes an attacker-controlled existing PDF whose...