CVE-2026-112406
High
Description
Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow can enter an infinite loop while rewriting PDF pages. PdfParser.rewrite_pages() follows Parent relationships without detecting a cycle in the page tree. An attacker can supply a cyclic PDF to an application that appends an image to that PDF. This can hold the worker at full CPU and deny service. This issue is fixed in version 13.0.0.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Python Pillow
PublishedOct 19, 2026
First seenOct 19, 2026
Weakness typeCWE-835CWE-835
How to fix
Update
- python pillow13.0.0 or later
- pillow13.0.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| python pillow | 5.1.0 ≤ v < 13.0.0 | 13.0.0 |
| pillowPyPI | 5.1.0 ≤ v < 13.0.0 | 13.0.0 |
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