---
id: CVE-2026-59186
title: >-
  OpenEXR is the reference implementation and specification for the EXR image
  format, widely used in the motion picture industry
summary: >-
  OpenEXR is the reference implementation and specification for the EXR image
  format, widely used in the motion picture industry. In versions before 3.2.11,
  3.3.0 through 3.3.12, and 3.4.0 through 3.4.13, a crafted tiled EXR can
  trigger a …
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H'
cwe:
  - CWE-122
  - CWE-190
  - CWE-787
published: '2026-08-25'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:07:31.353'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59186'
references:
  - url: >-
      https://github.com/AcademySoftwareFoundation/openexr/commit/71907b44ce9a1b05bf3934b8a7821752750731ab
    label: security-advisories@github.com
  - url: >-
      https://github.com/AcademySoftwareFoundation/openexr/commit/904141d3a1f86327ad1e2b93fc92ce2dd5881d34
    label: security-advisories@github.com
  - url: >-
      https://github.com/AcademySoftwareFoundation/openexr/commit/b1a5887372772d79328f4eb42b7f86352a38170b
    label: security-advisories@github.com
  - url: >-
      https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-f667-c4wm-c8gq
    label: security-advisories@github.com
  - url: >-
      https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-f667-c4wm-c8gq
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59186.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-59186'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2523655'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-59186'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59186'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.00415
epssPercentile: 0.33052
ingestedAt: '2026-09-09T21:22:45.552Z'
vendor: Red Hat
product: Red Hat Enterprise Linux 8
affected:
  - enterprise_linux 8
---

## Overview

OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions before 3.2.11, 3.3.0 through 3.3.12, and 3.4.0 through 3.4.13, a crafted tiled EXR can trigger a heap out-of-bounds write on 32-bit/ILP32 builds when read through the public TiledRgbaInputFile RGBA API. The file uses a small 40x40 dataWindow but a 65537x65537 tile size. On ILP32, the Array2D<Rgba> tile-conversion buffer size calculation overflows, allocates a much smaller heap buffer, and tile decode writes past that allocation. This issue is fixed in versions 3.2.11, 3.3.13, and 3.4.14.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 8 · no fix planned: Red Hat Enterprise Linux 8 · updated 2026-09-19 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59186.json)