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TI-2026-26792 Aliases CVE-2026-34543GHSA-vc68-257w-m432

OpenEXR: Heap information disclosure in PXR24 decompression via unchecked decompressed size (undo_pxr24_impl)

Priority HIGH 77CWE-908Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-908 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 version 3.4.0 to before version 3.4.8, sensitive information from heap memory may be leaked through the decoded pixel data (information disclosure). This occurs under default settings; simply reading a malicious EXR file is sufficient to trigger the issue, without any user interaction. This issue has been patched in version 3.4.8.

Why it matters now

Exploitation Proof of concept 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): 3.4.8openexr (PyPI): 3.4.8Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
AcademySoftwareFoundationopenexr3.4.0 to before 3.4.83.4.8Patch availableCNA
—openexr (PyPI)3.4.0 to before 3.4.83.4.8Patch availableGHSA-vc68-257w-m432
—openexr (PyPI)3.3.0 – 3.3.8—No fix listedGHSA-vc68-257w-m432
—openexr (PyPI)3.2.0 – 3.2.6—No fix listedGHSA-vc68-257w-m432
  • openexr VendorAcademySoftwareFoundation Affected 3.4.0 to before 3.4.8 Fixed in 3.4.8 Patch available CNA
  • openexr (PyPI) Vendor— Affected 3.4.0 to before 3.4.8 Fixed in 3.4.8 Patch available GHSA-vc68-257w-m432
  • openexr (PyPI) Vendor— Affected 3.3.0 – 3.3.8 Fixed in — No fix listed GHSA-vc68-257w-m432
  • openexr (PyPI) Vendor— Affected 3.2.0 – 3.2.6 Fixed in — No fix listed GHSA-vc68-257w-m432

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*3.2.0 to before 3.2.7; 3.3.0 to before 3.3.9; 3.4.0 to before 3.4.8VulnerableAcademy Software Foundation
  • cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:* Versions 3.2.0 to before 3.2.7; 3.3.0 to before 3.3.9; 3.4.0 to before 3.4.8 Vulnerable ·Academy Software Foundation

Remediation

  • Fix · CNA openexr (AcademySoftwareFoundation) Fixed in 3.4.8
  • Fix · GHSA-vc68-257w-m432 openexr (PyPI) Fixed in 3.4.8 Advisory →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Not affected: 4 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34543
  2. 2026-10-03 Alias added: GHSA-vc68-257w-m432

References

Exploit 1

Patch 1

Advisory 1

Other 2

  • 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