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…

在 GitHub Advisory Database 阅读

2026/10/23 01:00，GitHub Advisory Database 发布了“Pillow PDF append accepts malformed shared page-tree DAG causing resource exhaustion”（类型：漏洞公告）。严重程度为“高危”（high）。相关技术：Python。CVE：CVE-2026-96640。