---
id: CVE-2026-112398
title: >-
  Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code
  execution
summary: >-
  Pillow is a Python imaging library. Prior to 13.0.0, Pillow's FlashPix
  JPEG-tile decoder can write decoded scanlines beyond the allocated tile
  buffer. FlashPix (FPX) JPEG decoding selects raw mode LA with two bytes per
  pixel, while an un…
severity: critical
cvss: 9.2
cvssVector: 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-122
  - CWE-787
vendor: python-pillow
product: Pillow
affected:
  - Pillow < 13.0.0
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T21:07:25.229Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-112398'
references:
  - url: >-
      https://github.com/python-pillow/Pillow/security/advisories/GHSA-5x8w-8jj5-q52h
    label: >-
      https://github.com/python-pillow/Pillow/security/advisories/GHSA-5x8w-8jj5-q52h
  - url: >-
      https://github.com/python-pillow/Pillow/commit/242a059aedc1935097d9aa1dc3f099750467ba75
    label: >-
      https://github.com/python-pillow/Pillow/commit/242a059aedc1935097d9aa1dc3f099750467ba75
  - 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: '2026-10-19T21:43:56.135Z'
---

## Overview

Pillow is a Python imaging library. Prior to 13.0.0, Pillow's FlashPix JPEG-tile decoder can write decoded scanlines beyond the allocated tile buffer. FlashPix (FPX) JPEG decoding selects raw mode LA with two bytes per pixel, while an unrecognized JPEG mode can be decoded as JCS_UNKNOWN with four components, causing ImagingJpegDecode to write four-component scanlines into the two-byte tile buffer. An attacker can supply a crafted OLE2 FlashPix file to an application with the optional olefile dependency installed that opens or thumbnails untrusted input. This can corrupt heap memory and may allow arbitrary code execution. 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.