---
id: CVE-2026-112895
title: >-
  Pillow: Unbounded recursion parsing a PDF page tree or trailer chain
  (incomplete fix for CVE-2026-42310)
summary: >-
  Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow can
  exhaust resources while parsing an existing PDF during an append operation.
  PdfParser follows page-tree child references without cycle or duplication
  tracking and fo…
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-674
vendor: python-pillow
product: Pillow
affected:
  - 'Pillow >= 5.1.0, < 13.0.0'
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T21:57:14.207Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-112895'
references:
  - url: >-
      https://github.com/python-pillow/Pillow/security/advisories/GHSA-p4wg-p73j-c528
    label: >-
      https://github.com/python-pillow/Pillow/security/advisories/GHSA-p4wg-p73j-c528
  - url: >-
      https://github.com/python-pillow/Pillow/commit/e2ae7eacad6de68c37eb28b633a97bebacf2c5bf
    label: >-
      https://github.com/python-pillow/Pillow/commit/e2ae7eacad6de68c37eb28b633a97bebacf2c5bf
  - 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'
---

## Overview

Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow can exhaust resources while parsing an existing PDF during an append operation. PdfParser follows page-tree child references without cycle or duplication tracking and follows previous-trailer chains with only an exact repeated-offset guard, so deep or cyclic page trees and long chains of unique trailer offsets can exhaust the Python stack. Repeated non-cyclic /Kids references can also cause super-linear CPU and memory use. An attacker can supply such a PDF to an application that calls Image.save with PDF append enabled. This can raise an uncaught RecursionError or consume excessive CPU and memory before output is written, causing denial of service. This issue is fixed in version 13.0.0.

## Affected

- `Pillow >= 5.1.0, < 13.0.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.