{"id":"CVE-2026-112894","title":"Pillow: Quadratic-time DoS in PDF save_all (PdfParser.next_object_id)","summary":"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 previo…","severity":"high","cvss":8.7,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","cvssSource":"cna","cwe":["CWE-407"],"vendor":"python-pillow","product":"Pillow","affected":["Pillow >= 5.1.0, < 13.0.0"],"published":"2026-10-19","updated":"2026-10-19","sourceUpdated":"2026-10-19T21:55:19.424Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-112894","references":[{"url":"https://github.com/python-pillow/Pillow/security/advisories/GHSA-jg86-v3jv-hrpm","label":"https://github.com/python-pillow/Pillow/security/advisories/GHSA-jg86-v3jv-hrpm"},{"url":"https://github.com/python-pillow/Pillow/commit/f6a852555f1a1bdff7781abf25f1a3b8bd6ce6cb","label":"https://github.com/python-pillow/Pillow/commit/f6a852555f1a1bdff7781abf25f1a3b8bd6ce6cb"},{"url":"https://github.com/python-pillow/Pillow/releases/tag/13.0.0","label":"https://github.com/python-pillow/Pillow/releases/tag/13.0.0"}],"tags":["cve.org"],"ingestedAt":"2026-10-19T22:46:42.329Z","slug":"CVE-2026-112894","body":"## Overview\n\nPillow 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.\n\n## Affected\n\n- `Pillow >= 5.1.0, < 13.0.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}