CVE-2026-112894Pillow: Quadratic-time DoS in PDF save_all (PdfParser.next_object_id)

Descripción

Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow takes quadratic time to reserve PDF object identifiers when saving many frames with save_all enabled. PdfParser.next_object_id() repeatedly rebuilds and scans all previously reserved identifiers for every object. An attacker can supply a multi-frame image, including a small APNG with a large declared frame count, to an application that converts it to a multipage PDF. This can consume excessive CPU and deny service. This issue is fixed in version 13.0.0.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/python-pillow/Pillow/security/advisories/GHSA-jg86-v3jv-hrpm ExploitPatchVendor Advisory
• https://github.com/python-pillow/Pillow/commit/f6a852555f1a1bdff7781abf25f1a3b8bd6ce6cb Patch
• https://github.com/python-pillow/Pillow/releases/tag/13.0.0 Release Notes