---
id: CVE-2026-112896
title: >-
  Pillow: TIFF encoder ColorMap plane-size mismatch causes a heap out-of-bounds
  read
summary: >-
  Pillow is a Python imaging library. Prior to 13.0.0, Pillow's TIFF encoder can
  read beyond a ColorMap buffer when retained TIFF metadata has a plane size
  inconsistent with BitsPerSample. A small TIFF can be opened normally and then
  retai…
severity: high
cvss: 8.8
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-125
vendor: python-pillow
product: Pillow
affected:
  - Pillow < 13.0.0
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T21:59:17.743Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-112896'
references:
  - url: >-
      https://github.com/python-pillow/Pillow/security/advisories/GHSA-pchr-8j38-3x4p
    label: >-
      https://github.com/python-pillow/Pillow/security/advisories/GHSA-pchr-8j38-3x4p
  - url: >-
      https://github.com/python-pillow/Pillow/commit/d03dc3c587a9b0bdc9e4304d70d59a635a87b742
    label: >-
      https://github.com/python-pillow/Pillow/commit/d03dc3c587a9b0bdc9e4304d70d59a635a87b742
  - 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: '2026-10-19T22:46:42.320Z'
---

## Overview

Pillow is a Python imaging library. Prior to 13.0.0, Pillow's TIFF encoder can read beyond a ColorMap buffer when retained TIFF metadata has a plane size inconsistent with BitsPerSample. A small TIFF can be opened normally and then retain a crafted ColorMap that is reused when the image is saved. An application that re-encodes the attacker's TIFF with libtiff can trigger the out-of-bounds read. This can disclose heap memory in the output or crash the process. 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.