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TI-2026-26793 Aliases CVE-2026-34544GHSA-h762-rhv3-h25v

OpenEXR: integer overflow to OOB write in uncompress_b44_impl()

Priority HIGH 72CWE-190Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 4 fixed, 1 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 version 3.4.0 to before version 3.4.8, a crafted B44 or B44A EXR file can cause an out-of-bounds write in any application that decodes it via exr_decoding_run(). Consequences range from immediate crash (most likely) to corruption of adjacent heap allocations (layout-dependent). 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 0.00254 16th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial openexr (AcademySoftwareFoundation): 3.4.8openexr (PyPI): 3.4.8Red Hat: 2 advisoriesRed Hat: 4 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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
AcademySoftwareFoundationopenexr3.4.0 to before 3.4.83.4.8Patch availableCNA
—openexr (PyPI)3.4.0 to before 3.4.83.4.8Patch availableGHSA-h762-rhv3-h25v
—openexr (PyPI)3.3.0 – 3.3.8—No fix listedGHSA-h762-rhv3-h25v
—openexr (PyPI)3.2.0 – 3.2.6—No fix listedGHSA-h762-rhv3-h25v
  • 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-h762-rhv3-h25v
  • openexr (PyPI) Vendor— Affected 3.3.0 – 3.3.8 Fixed in — No fix listed GHSA-h762-rhv3-h25v
  • openexr (PyPI) Vendor— Affected 3.2.0 – 3.2.6 Fixed in — No fix listed GHSA-h762-rhv3-h25v

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-h762-rhv3-h25v openexr (PyPI) Fixed in 3.4.8 Advisory →

Red Hat 2 advisories

  • RHSA-2026:86983 Released 2026-10-21 · Red Hat rating Important
    openexr security update
    • Red Hat Enterprise Linux AppStream (v. 9) openexr-3.1.1-3.el9_8.5, openexr-libs-3.1.1-3.el9_8.5
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) openexr-devel-3.1.1-3.el9_8.5
  • RHSA-2026:84796 Released 2026-10-19 · Red Hat rating Important
    openexr security update
    • Red Hat Enterprise Linux AppStream (v. 10) openexr-3.1.10-8.el10_2.5, openexr-libs-3.1.10-8.el10_2.5
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) openexr-devel-3.1.10-8.el10_2.5

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
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:84796
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:86983
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:84796
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:86983
Not affected: 2 products
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34544
  2. 2026-10-03 Alias added: GHSA-h762-rhv3-h25v
  3. 2026-10-20 Fix available: RHSA-2026:84796 · Red Hat
  4. 2026-10-20 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · Red Hat
  5. 2026-10-21 Fix available: RHSA-2026:86983 · Red Hat
  6. 2026-10-21 Fix available: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · Red Hat

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