---
id: CVE-2026-112392
title: 'Pillow: NULL dereference in ImagingExpand via rank filters on zero-size images'
summary: >-
  Pillow is a Python imaging library. Prior to 13.0.0, Pillow's rank-based
  filters can dereference invalid image storage for a zero-size image.
  ImagingExpand() allocates a non-empty output and then faults while replicating
  edges by reading…
severity: high
cvss: 8.2
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-476
vendor: python-pillow
product: Pillow
affected:
  - Pillow < 13.0.0
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T21:17:18.908Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-112392'
references:
  - url: >-
      https://github.com/python-pillow/Pillow/security/advisories/GHSA-27h8-gf7j-v5hc
    label: >-
      https://github.com/python-pillow/Pillow/security/advisories/GHSA-27h8-gf7j-v5hc
  - url: >-
      https://github.com/python-pillow/Pillow/commit/443e3130a8c11594fd0e296afad497e11e678961
    label: >-
      https://github.com/python-pillow/Pillow/commit/443e3130a8c11594fd0e296afad497e11e678961
  - 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: '2026-10-19T21:43:56.126Z'
---

## Overview

Pillow is a Python imaging library. Prior to 13.0.0, Pillow's rank-based filters can dereference invalid image storage for a zero-size image. ImagingExpand() allocates a non-empty output and then faults while replicating edges by reading the first pixel from empty input storage; ImagingRankFilter is never reached. An attacker can supply or cause creation of a zero-size image to an application that applies a rank, median, minimum, or maximum filter. This causes a native process crash. This issue is fixed in version 13.0.0.

## Affected

- `Pillow < 13.0.0`

## Remediation

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