---
id: CVE-2026-42216
title: >-
  OpenEXR provides the specification and reference implementation of the EXR
  file format, an image storage format for the motion picture industry
summary: >-
  OpenEXR provides the specification and reference implementation of the EXR
  file format, an image storage format for the motion picture industry. From
  versions 3.0.0 to before 3.2.9, 3.3.0 to before 3.3.11, and 3.4.0 to before
  3.4.11, IDM…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'
cwe:
  - CWE-125
  - CWE-130
vendor: openexr
product: openexr
affected:
  - 'openexr >= 3.0.0, < 3.2.9'
  - 'openexr >= 3.3.0, < 3.3.11'
  - 'openexr >= 3.4.0, < 3.4.11'
patched:
  - openexr 3.4.11
published: '2026-05-07'
updated: '2026-07-13'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42216'
references:
  - url: >-
      https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-65j8-95g9-jgj4
    label: security-advisories@github.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:38498'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:38499'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-42216'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2467633'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-65j8-95g9-jgj4
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42216.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-42216'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42216'
  - url: 'https://access.redhat.com/errata/RHSA-2026:39024'
  - url: 'https://access.redhat.com/errata/RHSA-2026:39027'
  - url: 'https://access.redhat.com/errata/RHSA-2026:39026'
  - url: 'https://access.redhat.com/errata/RHSA-2026:39025'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - exploit-available
epss: 0.00465
epssPercentile: 0.39339
ingestedAt: '2026-07-13T13:27:17.950Z'
scores:
  nvd: 9.1
  vendor: 8.1
  cna: 8.8
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-05-07T14:12:43.093935Z'
---

## Overview

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From versions 3.0.0 to before 3.2.9, 3.3.0 to before 3.3.11, and 3.4.0 to before 3.4.11, IDManifest::init() reconstructs strings from a prefix-compressed representation. If the previous string is longer than 255 bytes, the next string is expected to begin with a 2-byte prefix length. The code reads stringList[i][0] and stringList[i][1] without checking that the current string has at least two bytes. This issue has been patched in versions 3.2.9, 3.3.11, and 3.4.11.

## Affected

- `openexr >= 3.0.0, < 3.2.9`
- `openexr >= 3.3.0, < 3.3.11`
- `openexr >= 3.4.0, < 3.4.11`

## Remediation

Upgrade past the affected range:

- `openexr 3.4.11`

## Vendor advisories

- **RHSA-2026:39024** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-07-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:39024)
- **RHSA-2026:38499** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-07-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:38499)
- **RHSA-2026:39027** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-07-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:39027)
- **RHSA-2026:39026** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-07-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:39026)
- **RHSA-2026:39025** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-07-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:39025)
- **RHSA-2026:38498** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-07-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:38498)
- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-09-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42216.json)