---
id: CVE-2026-63419
title: >-
  OpenImageIO is a toolset for reading, writing, and manipulating image files of
  any image file format relevant to VFX / animation
summary: >-
  OpenImageIO is a toolset for reading, writing, and manipulating image files of
  any image file format relevant to VFX / animation. Prior to 3.0.21.0,
  3.1.16.0, and 3.2.0.3-beta1, A zbuffer-only tiled iff is exposed with a 16-bit
  public im…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-787
vendor: AcademySoftwareFoundation
product: OpenImageIO
affected:
  - OpenImageIO < 3.0.21.0
  - 'OpenImageIO >= 3.1.0.0, < 3.1.16.0'
  - 'OpenImageIO >= 3.2.0.0-dev, < 3.2.0.3-beta1'
published: '2026-09-18'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:22:19.873'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63419'
references:
  - url: >-
      https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/9cda48b150294c7f024e680a6c9b0402e50f4816
    label: security-advisories@github.com
  - url: 'https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5268'
    label: security-advisories@github.com
  - url: >-
      https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.0.21.0
    label: security-advisories@github.com
  - url: >-
      https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.16.0
    label: security-advisories@github.com
  - url: >-
      https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-w6wc-gcf4-5pj2
    label: security-advisories@github.com
  - url: >-
      https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-w6wc-gcf4-5pj2
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00186
epssPercentile: 0.07401
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-18T17:33:32.010538Z'
ingestedAt: '2026-09-18T16:45:41.387Z'
---

## Overview

OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1, A zbuffer-only tiled iff is exposed with a 16-bit public imagespec while the decoder retains a 32-bit internal pixel size. iffinput::read_native_tile() copies according to m_header.pixel_bytes() rather than imagespec::tile_bytes(true), and a failed read can leave m_buf nonempty so a later call copies partially initialized data into the undersized caller buffer, resulting in a heap out-of-bounds write and memory corruption. The affected implementation is identified by src/iff.imageio/iffinput.cpp, IffInput::read_native_tile(), ImageSpec::tile_bytes(true), m_header.pixel_bytes(), ZBUFFER, and m_buf, which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1.

## Remediation

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