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…
Read on GitHub Advisory Database
| CVE | CVE-2026-96640 |
|---|---|
| Source | GitHub Advisory Database |
| Fetched | 10/23/2026, 05:09 AM |
| Data | Markdown JSON |
On 10/23/2026, 01:00 AM, GitHub Advisory Database published "Pillow PDF append accepts malformed shared page-tree DAG causing resource exhaustion" (type: Advisory). Severity is "High" (high). Related technologies: Python. CVE: CVE-2026-96640.