CVE-2026-96638
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Python Pillow
PublishedOct 21, 2026
First seenOct 21, 2026
How to fix
Update
- python pillow13.0.0 or later
- pillow13.0.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| python pillow | 9.1.0 ≤ v < 13.0.0 | 13.0.0 |
| pillowPyPI | 9.1.0 ≤ v < 13.0.0 | 13.0.0 |
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