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

影響: pip:Pillow >= 5.1.0, < 13.0.0 → 13.0.0

Pillow's documented PDF append path can spend disproportionate CPU time on a compact malformed PDF page tree. An attacker who can supply an existing PDF to an application that appends an image with Image.save(..., format="PDF", append=True) can provide a malformed /Pages tree where each level repeats the same child /Pages reference in /Kids. Pillow treats the graph as a tree and expands each repeated reference in PdfParser.linearize_page_tree() without tracking visited or duplicate indirect ref…

GitHub Advisory Database에서 읽기

2026. 10. 23. 오전 01:00, GitHub Advisory Database에서 "Pillow PDF append accepts malformed shared page-tree DAG causing resource exhaustion"을(를) 게시했습니다 (유형: 취약점 권고). 심각도는 "높음"(high)입니다. 관련 기술: Python. CVE: CVE-2026-96640.