8.7
High
CVE-2026-112399 Pillow is a Python imaging library
Description
Pillow is a Python imaging library. From 8.1.0 until 13.0.0, Pillow can allocate an APNG disposal background at the full canvas size before applying the decompression-bomb check. A crafted APNG with a small first frame, a very large declared canvas, and background disposal or first-frame OP_PREVIOUS reaches PngImageFile._seek while Image.open() positions frame zero. The full-canvas allocation occurs inside Image.open() without requiring pixel loading or frame iteration. This can exhaust memory and deny service. This issue is fixed in version 13.0.0.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Pillow 8.1 | 8.1.0 → < 13.0.0 | 13.0.0 |
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