CVE-2026-96636
Medium
Description
Pillow is a Python imaging library. Prior to 13.0.0, MpoImageFile.seek() and DcxImageFile.seek() reparse later MPO or DCX frames and replace self._size without rerunning Image._decompression_bomb_check(). A crafted multi-frame image can use a tiny first frame to pass Image.open() and then declare an over-limit later frame. Normal frame iteration through seek(), load(), or ImageSequence.Iterator can decode that frame and commit 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 | v < 13.0.0 | 13.0.0 |
| pillowPyPI | v < 13.0.0 | 13.0.0 |
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