CVE-2026-112391
High
Description
Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow's PdfParser.get_value() can recurse without a limit while reading nested PDF objects. The parser follows attacker-controlled arrays and dictionaries when an existing PDF is opened for append. An attacker can provide a deeply nested PDF to an application that saves an image with PDF append enabled. This can raise an uncaught RecursionError or terminate the worker, causing denial of 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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