CVE-2026-112399

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.

• https://github.com/python-pillow/Pillow/commit/f1acfc54c53502948d0d14121872061df931db48
• https://github.com/python-pillow/Pillow/releases/tag/13.0.0
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xm2-6676-qcp9

• https://github.com/python-pillow/Pillow/commit/f1acfc54c53502948d0d14121872061df931db48
• https://github.com/python-pillow/Pillow/releases/tag/13.0.0
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xm2-6676-qcp9

• HIGHCVE-2020-37280PoC
• UNSCOREDCVE-2026-102463PoC
• UNSCOREDCVE-2026-102466PoC
• HIGHCVE-2026-102504PoC
• UNSCOREDCVE-2026-102509
• UNSCOREDCVE-2026-102510
• HIGHCVE-2026-102731
• MEDIUMCVE-2026-102809PoC

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