CVE-2026-96638: CWE-400: Uncontrolled Resource Consumption in python-pillow Pillow
Description
Pillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.
CVSS v3.1
Score 6.5medium
Affected software
python-pillow
Pillow
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-23T14:35:50.130Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad928464d27ba8daa01072b
Added to database: 10/21/2026, 21:01:58 UTC
Last updated: 10/21/2026, 21:01:58 UTC
Views: 1
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