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Public proof of conceptFix available

CVE-2026-42216

A public proof of concept exists; no exploitation attested.

  • Published2026-05-07
  • Fixed in3.4.11 · 3.3.11 · 3.2.9
  • WeaknessCWE-125 · CWE-130

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-05-0704:16CVE publishedNVD

Versions per branch

NVD
Openexr
BranchAffectedFixed in
3.4≥ 3.4.0, < 3.4.113.4.11
3.3≥ 3.3.0, < 3.3.113.3.11
3.x≥ 3.0.0, < 3.2.93.2.9

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • AcademySoftwareFoundation openexr
    Affected
    • = >= 3.0.0, < 3.2.9no fix stated
    • = >= 3.3.0, < 3.3.11no fix stated
    • = >= 3.4.0, < 3.4.11no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-05-07

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • openexrWolfiall versions · fixed in 3.4.10-r0and 7 other packages
  • openexrUbuntu:Pro:26.04:LTSall versions · no fixed version listed
  • openexrUbuntu:Pro:24.04:LTSall versions · no fixed version listed
  • openexrUbuntu:Pro:22.04:LTSall versions · no fixed version listed
  • openexrUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • openexrUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • openexrUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • openexrUbuntu:26.10all versions · no fixed version listed

44 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-42216 Red Hat Product Security236 products fixed · 3 known affected

    OpenEXR: OpenEXR: Information disclosure and denial of service via malformed EXR files

    OpenEXR-devel as a component of Red Hat Enterprise Linux 6 · OpenEXR-libs as a component of Red Hat Enterprise Linux 6 · OpenEXR.src as a component of Red Hat Enterprise Linux 6

  • RHSA-2026:81128 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat AI Base Images 3.2.4 (CPU)

  • RHSA-2026:80760 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat AI Base Images 3.2.4 (Spyre)

  • RHSA-2026:80739 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat AI Base Images 3.2.4 (CUDA 12.9)

  • RHSA-2026:74674 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat AI Base Images 3.4.3 (Neuron)

  • RHSA-2026:74463 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat AI Base Images 3.2.3 (ROCm 7.0)

11 more advisories

Full record on NVD

Fix

  1. Update Openexr to 3.4.11 · 3.3.11 · 3.2.9
  2. Vendor fix Red Hat Product Security RHSA-2026:81128 · 4 productsFor more information visit https://access.redhat.com/errata/RHSA-2026:81128
  3. Vendor fix Red Hat Product Security RHSA-2026:80760 · 3 productsFor more information visit https://access.redhat.com/errata/RHSA-2026:80760
  4. Vendor fix Red Hat Product Security RHSA-2026:80739 · 2 productsFor more information visit https://access.redhat.com/errata/RHSA-2026:80739
  5. Vendor fix Red Hat Product Security RHSA-2026:74674 · 1 productFor more information visit https://access.redhat.com/errata/RHSA-2026:74674
  6. Vendor fix Red Hat Product Security RHSA-2026:74463 · 1 productFor more information visit https://access.redhat.com/errata/RHSA-2026:74463
  7. Vendor fix Red Hat Product Security RHSA-2026:74462 · 2 productsFor more information visit https://access.redhat.com/errata/RHSA-2026:74462

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2026-05-07
  • CNACVSS 4.08.8known since 2026-10-27
  • CNACVSS 3.18.1known since 2026-10-27
  • NVDCVSS 3.19.1read 2026-10-27
  • CNAweakness (CWE)CWE-125, CWE-130known since 2026-10-27
  • FIRST EPSSEPSS score0.5 %2026-11-08
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-05-07
Last Modified
2026-10-26
NVD status
Modified

Frequently asked questions

What is CVE-2026-42216?

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.

Is CVE-2026-42216 actively exploited?

A proof-of-concept exploit exists for CVE-2026-42216, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-42216?

CVE-2026-42216 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

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