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TI-2026-26835 Aliases CVE-2026-34588GHSA-588r-cr5c-w6hf

OpenEXR has a signed 32-bit Overflow in PIZ Decoder Leads to OOB Read/Write

Priority MEDIUM 40CWE-125Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 14 fixed, 2 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-190 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00501 43rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial openexr (AcademySoftwareFoundation): 3.2.7, 3.3.9, 3.4.9OpenEXR (PyPI): 3.2.7, 3.3.9, 3.4.9Red Hat: 14 advisoriesRed Hat: 14 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AcademySoftwareFoundationopenexr3.1.0 – 3.1.13; 3.2.0 to before 3.2.7; 3.3.0 to before 3.3.9; 3.4.0 to before 3.4.93.2.7, 3.3.9, 3.4.9Patch availableCNA
—OpenEXR (PyPI)3.1.0 to before 3.2.73.2.7Patch availableGHSA-588r-cr5c-w6hf
—OpenEXR (PyPI)3.3.0 to before 3.3.93.3.9Patch availableGHSA-588r-cr5c-w6hf
—OpenEXR (PyPI)3.4.0 to before 3.4.93.4.9Patch availableGHSA-588r-cr5c-w6hf
  • openexr VendorAcademySoftwareFoundation Affected 3.1.0 – 3.1.13; 3.2.0 to before 3.2.7; 3.3.0 to before 3.3.9; 3.4.0 to before 3.4.9 Fixed in 3.2.7, 3.3.9, 3.4.9 Patch available CNA
  • OpenEXR (PyPI) Vendor— Affected 3.1.0 to before 3.2.7 Fixed in 3.2.7 Patch available GHSA-588r-cr5c-w6hf
  • OpenEXR (PyPI) Vendor— Affected 3.3.0 to before 3.3.9 Fixed in 3.3.9 Patch available GHSA-588r-cr5c-w6hf
  • OpenEXR (PyPI) Vendor— Affected 3.4.0 to before 3.4.9 Fixed in 3.4.9 Patch available GHSA-588r-cr5c-w6hf

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*3.1.0 to before 3.2.7; 3.3.0 to before 3.3.9; 3.4.0 to before 3.4.9VulnerableAcademy Software Foundation
  • cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:* Versions 3.1.0 to before 3.2.7; 3.3.0 to before 3.3.9; 3.4.0 to before 3.4.9 Vulnerable ·Academy Software Foundation

Remediation

  • Fix · CNA openexr (AcademySoftwareFoundation) Fixed in 3.2.7, 3.3.9, 3.4.9
  • Fix · GHSA-588r-cr5c-w6hf OpenEXR (PyPI) Fixed in 3.2.7 Advisory →
  • Fix · GHSA-588r-cr5c-w6hf OpenEXR (PyPI) Fixed in 3.3.9 Advisory →
  • Fix · GHSA-588r-cr5c-w6hf OpenEXR (PyPI) Fixed in 3.4.9 Advisory →

Red Hat 14 advisories

  • RHSA-2026:74674 Released 2026-10-01 · Red Hat rating Important
    Red Hat AI Base Images 3.4.3 (Neuron)
    • Red Hat OpenShift AI 3.4 registry.redhat.io/rhai/base-image-neuron-rhel9
  • RHSA-2026:30089 Released 2026-06-25 · Red Hat rating Critical
    Red Hat AI Inference Server 3.3.5 (CUDA)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/vllm-cuda-rhel9
  • RHSA-2026:30088 Released 2026-06-25 · Red Hat rating Critical
    Red Hat AI Inference Server 3.3.5 (ROCm)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/vllm-rocm-rhel9
Show 11 more Red Hat advisories
  • RHSA-2026:30087 Released 2026-06-25 · Red Hat rating Critical
    Red Hat AI Inference Server 3.3.5 (Spyre)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/vllm-spyre-rhel9
  • RHSA-2026:30078 Released 2026-06-25 · Red Hat rating Important
    Red Hat AI Inference Server Model Optimization Tools 3.3.5 (CUDA)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/model-opt-cuda-rhel9
  • RHSA-2026:19587 Released 2026-05-20 · Red Hat rating Important
    openexr security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) openexr-3.1.1-2.el9_0.3, openexr-libs-3.1.1-2.el9_0.3
  • RHSA-2026:19359 Released 2026-05-19 · Red Hat rating Important
    openexr security update
    • Red Hat Enterprise Linux AppStream (v. 9) openexr-3.1.1-3.el9_8.2, openexr-libs-3.1.1-3.el9_8.2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) openexr-devel-3.1.1-3.el9_8.2
  • RHSA-2026:19146 Released 2026-05-19 · Red Hat rating Important
    openexr security update
    • Red Hat Enterprise Linux AppStream (v. 10) openexr-3.1.10-8.el10_2.2, openexr-libs-3.1.10-8.el10_2.2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) openexr-devel-3.1.10-8.el10_2.2
  • RHSA-2026:17660 Released 2026-05-14 · Red Hat rating Important
    openexr security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) openexr-devel-3.1.1-3.el9_6.2
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) openexr-3.1.1-3.el9_6.2, openexr-libs-3.1.1-3.el9_6.2
  • RHSA-2026:17658 Released 2026-05-14 · Red Hat rating Important
    openexr update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) openexr-devel-3.1.1-2.el9_4.3
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) openexr-3.1.1-2.el9_4.3, openexr-libs-3.1.1-2.el9_4.3
  • RHSA-2026:17659 Released 2026-05-14 · Red Hat rating Important
    openexr security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) openexr-3.1.1-2.el9_2.3, openexr-libs-3.1.1-2.el9_2.3
  • RHSA-2026:17656 Released 2026-05-14 · Red Hat rating Important
    openexr security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) openexr-3.1.10-8.el10_0.2, openexr-libs-3.1.10-8.el10_0.2
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) openexr-devel-3.1.10-8.el10_0.2
  • RHSA-2026:15888 Released 2026-05-11 · Red Hat rating Important
    openexr security update
    • Red Hat Enterprise Linux AppStream (v. 10) openexr-3.1.10-8.el10_1.2, openexr-libs-3.1.10-8.el10_1.2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) openexr-devel-3.1.10-8.el10_1.2
  • RHSA-2026:15887 Released 2026-05-11 · Red Hat rating Important
    openexr security update
    • Red Hat Enterprise Linux AppStream (v. 9) openexr-3.1.1-3.el9_7.2, openexr-libs-3.1.1-3.el9_7.2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) openexr-devel-3.1.1-3.el9_7.2

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat AI Inference Server 3.3Fixed RHSA-2026:30078, RHSA-2026:30087, RHSA-2026:30088, RHSA-2026:30089
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:17658
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:17660
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:15888, RHSA-2026:19146
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:15887, RHSA-2026:19359
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:19587
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:17659
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:17656
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:17658
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:17660
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:15888, RHSA-2026:19146
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:15887, RHSA-2026:19359
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:17656
Red Hat OpenShift AI 3.4Fixed RHSA-2026:74674
Not affected: 1 product
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34588
  2. 2026-10-03 Alias added: GHSA-588r-cr5c-w6hf

References

Exploit 1

Advisory 1

Other 4

  • TI-2026-30739 OpenColorIO vulnerable to stack buffer overflow via unbounded `sscanf %s` in Spi3D (.spi3d) LUT parser CVSS 4.0HIGH 8.4
  • TI-2026-38605 OpenEXR: Unhandled assert abort in HTJ2K decoder via crafted QCD marker (DoS) CVSS 4.0HIGH 7.1
  • TI-2026-48281 OpenEXR: Heap out-of-bounds write in exrmultiview with subsampled channel union CVSS 3.1HIGH 7.1
  • TI-2026-48279 OpenEXR: Heap buffer overflow in PyOpenEXR from literal/prefixed RGB channel name collision CVSS 3.1HIGH 7.1
  • TI-2026-42768 OpenEXR: Heap OOB read in SampleCountChannel row when using nonzero dataWindow CVSS 3.1HIGH 7.1
  • TI-2026-42338 OpenEXR: Out-of-bounds read in DeepImageChannel::row() for non-zero dataWindow origin CVSS 3.1HIGH 7.1
See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences