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[ CVE-2026-112400 · Published 19 Oct 2026 ]

Pillow: GIF seek keeps rejected size after DecompressionBombError, allowing DoS

CVSS 8.7 EPSS <1%Fix available

[ Why it matters ]Priority signals

  • Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

Pillow is a Python imaging library. From 9.2.0 until 13.0.0, Pillow can retain a rejected GIF frame size after a decompression-bomb exception. In GifImageFile._seek, a crafted GIF can leave rejected dimensions stored after Image.DecompressionBombError; if an application catches that exception and continues processing the same image object, later seek or load operations allocate according to those dimensions and can exhaust memory, denying service. This issue is fixed in version 13.0.0.

[ Fixes ]Fixes and patches

  • Pillow 13.0.0Fixed version · GitHub Advisories · pip package Pillow: upgrade to 13.0.0 or later (affected >= 9.2.0, < 13.0.0)

[ Packages ]Affected open-source packages

[ References ]References