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No exploitation reportedFix available

CVE-2026-34588

No exploitation reported by the sources we read.

  • Published2026-04-06
  • Fixed in3.4.9 · 3.3.9 · 3.2.7
  • WeaknessCWE-125 · CWE-190 · CWE-787

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 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working wavelet pointer with signed 32-bit arithmetic. Because nx, ny, and wcount are int, a crafted EXR file can make this product overflow and wrap. The next channel then decodes from an incorrect address. The wavelet decode path operates in place, so this yields both out-of-bounds reads and out-of-bounds writes. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.

Timeline

dates in UTC
  1. 2026-04-0616:16CVE publishedNVD

Versions per branch

NVD · OSV
Openexr
BranchAffectedFixed in
3.4≥ 3.4.0, < 3.4.93.4.9
3.3≥ 3.3.0, < 3.3.93.3.9
3.x≥ 3.1.0, < 3.2.73.2.7

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
    • = >= 3.1.0, <= 3.1.13no fix stated
    • = >= 3.2.0, < 3.2.7no fix stated
    • = >= 3.3.0, < 3.3.9no fix stated
    • = >= 3.4.0, < 3.4.9no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-04-07

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

  • openexrUbuntu:Pro:26.04:LTSall versions · fixed in 3.1.13-2ubuntu0.26.04.1~esm1
  • openexrUbuntu:Pro:24.04:LTSall versions · fixed in 3.1.5-5.1ubuntu0.1~esm1
  • openexrUbuntu:Pro:22.04:LTSall versions · fixed in 2.5.7-1ubuntu0.1~esm2
  • openexrUbuntu:Pro:20.04:LTSall versions · fixed in 2.3.0-6ubuntu0.5+esm2
  • openexrUbuntu:Pro:18.04:LTSall versions · fixed in 2.2.0-11.1ubuntu1.9+esm1
  • openexrUbuntu:Pro:16.04:LTSall versions · fixed in 2.2.0-10ubuntu2.6+esm4
  • openexrUbuntu:26.10all versions · no fixed version listed
  • openexrUbuntu:25.10all versions · no fixed version listed

61 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-34588 Red Hat Product Security350 products fixed · 7 known affected

    OpenEXR: OpenEXR: Arbitrary code execution and information disclosure via crafted EXR file

    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 · +4 more

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

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

  • RHSA-2026:30089 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat AI Inference Server 3.3.5 (CUDA)

  • RHSA-2026:30088 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat AI Inference Server 3.3.5 (ROCm)

  • RHSA-2026:30087 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat AI Inference Server 3.3.5 (Spyre)

  • RHSA-2026:30078 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat AI Inference Server Model Optimization Tools 3.3.5 (CUDA)

9 more advisories

Full record on NVD

Fix

  1. Update Openexr to 3.4.9 · 3.3.9 · 3.2.7
  2. Vendor fix Red Hat Product Security RHSA-2026:74674 · 1 productFor more information visit https://access.redhat.com/errata/RHSA-2026:74674
  3. Vendor fix Red Hat Product Security RHSA-2026:30089 · 2 productsFor more information visit https://access.redhat.com/errata/RHSA-2026:30089
  4. Vendor fix Red Hat Product Security RHSA-2026:30088 · 1 productFor more information visit https://access.redhat.com/errata/RHSA-2026:30088
  5. Vendor fix Red Hat Product Security RHSA-2026:30087 · 3 productsFor more information visit https://access.redhat.com/errata/RHSA-2026:30087
  6. Vendor fix Red Hat Product Security RHSA-2026:30078 · 2 productsFor more information visit https://access.redhat.com/errata/RHSA-2026:30078
  7. Vendor fix Red Hat Product Security RHSA-2026:19587 · 25 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258

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 decisionnone2026-04-07
  • CNACVSS 4.08.6known since 2026-10-27
  • CNACVSS 3.18.8known since 2026-10-27
  • NVDCVSS 3.17.8read 2026-10-27
  • CNAweakness (CWE)CWE-125, CWE-190, CWE-787known since 2026-10-27
  • FIRST EPSSEPSS score0.5 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-04-08

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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
2026-04-06
Last Modified
2026-10-26
NVD status
Modified
GitHub Advisory
GHSA-588r-cr5c-w6hf

Frequently asked questions

What is CVE-2026-34588?

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working wavelet pointer with signed 32-bit arithmetic. Because nx, ny, and wcount are int, a crafted EXR file can make this product overflow and wrap. The next channel then decodes from an incorrect address. The wavelet decode path operates in place, so this yields both out-of-bounds reads and out-of-bounds writes. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.

Is CVE-2026-34588 actively exploited?

Active exploitation of CVE-2026-34588 has not been confirmed. Its EPSS score was 0.5% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-34588?

CVE-2026-34588 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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