---
id: CVE-2026-55059
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. Versions prior to 3.2.10,
  3.3.12 and 3.4.13 contain a heap out-of-bounds write in
  Imf_4_0::SampleCountChannel…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H'
cwe:
  - 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-2026-55059'
references:
  - url: >-
      https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-54cp-3rq6-7mq8
    label: security-advisories@github.com
  - url: >-
      https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-54cp-3rq6-7mq8
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00148
epssPercentile: 0.03309
ingestedAt: '2026-09-09T21:22:45.549Z'
---

## Overview

OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. Versions prior to 3.2.10, 3.3.12 and 3.4.13 contain a heap out-of-bounds write in Imf_4_0::SampleCountChannel::set(int r, unsigned int newNumSamples[]). The row-based sample-count setter computes the target Y coordinate with dataWindow.min.x instead of dataWindow.min.y. For a valid deep image data window where min.x != min.y, a valid row index can be translated into an invalid Y coordinate, causing writes before the allocated _numSamples buffer. The vulnerability is reachable through the public OpenEXRUtil DeepImage API and can lead to heap corruption and process crashes. This issue has been fixed in versions 3.2.10, 3.3.12 and 3.4.13.

## Remediation

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