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[ CVE-2026-112891 · Published 19 Oct 2026 ]

Pillow: Quadratic GIF comment copying during save

CVSS 6.9 EPSS <1%Fix available

[ Description ]Official description

Pillow is a Python imaging library. From 9.2.0 until 13.0.0, Pillow performs quadratic copying when saving a GIF with a long comment. _get_global_header() repeatedly copies portions of comment data while assembling the global header, including comments retained from an untrusted input image. An attacker can supply an image with a large GIF comment to an application that saves it as GIF. This can consume excessive CPU and delay or deny 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