HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-96640 — Pillow is a Python imaging library. From 5.1.0 until 13.0.0, PdfParser.linearize...

·Source: NIST NVD

Updated:

Executive Summary

Pillow is a Python imaging library. From 5.1.0 until 13.0.0, PdfParser.linearize_page_tree() 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 /Kids arrays repeatedly reference the same child /Pages node, Pillow expands the shared subtree as

Analysis

Pillow is a Python imaging library. From 5.1.0 until 13.0.0, PdfParser.linearize_page_tree() 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 /Kids arrays repeatedly reference the same child /Pages node, Pillow expands the shared subtree as distinct pages. A compact malformed PDF can therefore create exponentially many page references and consume disproportionate CPU before the append completes. This issue is fixed in version 13.0.0. CVSS Score: 7.5. Published: 2026-10-21T21:20:32.357.

Indicators of Compromise (1)

CVE (1)
CVE-2026-96640
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Oct 21, 2026. Verified by: NIST.

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