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.
References
Configurations
History
28 Oct 2026, 02:17
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/python-pillow/Pillow/security/advisories/GHSA-mrfp-p49p-3hf2 - Vendor Advisory |
27 Oct 2026, 14:25
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:* | |
| References | () https://github.com/python-pillow/Pillow/commit/6f0e7ee1f9c2fe227906f8a4b926e6622b702bc7 - Patch | |
| References | () https://github.com/python-pillow/Pillow/pull/10093 - Issue Tracking | |
| References | () https://github.com/python-pillow/Pillow/releases/tag/13.0.0 - Release Notes | |
| References | () https://github.com/python-pillow/Pillow/security/advisories/GHSA-mrfp-p49p-3hf2 - Vendor Advisory | |
| First Time |
Python
Python pillow |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.5 |
21 Oct 2026, 21:20
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-10-21 21:20
Updated : 2026-10-28 02:17
NVD link : CVE-2026-96640
Mitre link : CVE-2026-96640
CVE.ORG link : CVE-2026-96640
JSON object : View
Products Affected
python
- pillow