BlogPHP2Shell Exploitation: How Secure.com Can Protect YouRead more
← CVE Radar

CVE-2026-96640Pillow 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.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.

8.2 HIGHEPSS 0.60%Not in KEVNVD: Modified

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
8.2HIGH4.0GitHub_M (CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5HIGH3.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CVE ID
CVE-2026-96640
Status
Modified
Assigner (CNA)
GitHub_M
Published
Oct 21, 2026
Last modified
2026-10-28 02:17 UTC
Weaknesses
  • CWE-400 · Uncontrolled Resource Consumption
  • CWE-407 · Inefficient Algorithmic Complexity

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 08:57 UTC.