CVE-2026-112895: CWE-674: Uncontrolled Recursion in python-pillow Pillow
Description
Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow can exhaust resources while parsing an existing PDF during an append operation. PdfParser follows page-tree child references without cycle or duplication tracking and follows previous-trailer chains with only an exact repeated-offset guard, so deep or cyclic page trees and long chains of unique trailer offsets can exhaust the Python stack. Repeated non-cyclic /Kids references can also cause super-linear CPU and memory use. An attacker can supply such a PDF to an application that calls Image.save with PDF append enabled. This can raise an uncaught RecursionError or consume excessive CPU and memory before output is written, causing denial of service. This issue is fixed in version 13.0.0.
CVSS v4.0
Score 8.7high
Affected software
python-pillow
Pillow
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-19T20:16:09.856Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad693df2cdf04f656974831
Added to database: 10/19/2026, 22:04:15 UTC
Last updated: 10/19/2026, 22:04:15 UTC
Views: 1
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