TI-2026-26836 Aliases CVE-2026-34589 GHSA-p8xc-w3q4-h64x

OpenEXR: DWA Lossy Decoder Heap Out-of-Bounds Write

LOW 39CWE-190Published 2026-04-06 · Updated 2026-07-15

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: 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 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, the DWA lossy decoder constructs temporary per-component block pointers using signed 32-bit arithmetic. For a large enough width, the calculation overflows and later decoder stores operate on a wrapped pointer outside the allocated rowBlock backing store. 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 0.00426 37th 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: 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

Vendor	Product	Affected versions	Fixed in	Status	Source
AcademySoftwareFoundation	openexr	3.2.0 to before 3.2.7; 3.3.0 to before 3.3.9; 3.4.0 to before 3.4.9	3.2.7, 3.3.9, 3.4.9	Patch available	CNA
—	OpenEXR (PyPI)	3.2.0 to before 3.2.7	3.2.7	Patch available	GHSA-p8xc-w3q4-h64x
—	OpenEXR (PyPI)	3.3.0 to before 3.3.9	3.3.9	Patch available	GHSA-p8xc-w3q4-h64x
—	OpenEXR (PyPI)	3.4.0 to before 3.4.9	3.4.9	Patch available	GHSA-p8xc-w3q4-h64x

openexr VendorAcademySoftwareFoundation Affected 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 3.2.0 to before 3.2.7 Fixed in 3.2.7 Patch available GHSA-p8xc-w3q4-h64x
OpenEXR (PyPI) Vendor— Affected 3.3.0 to before 3.3.9 Fixed in 3.3.9 Patch available GHSA-p8xc-w3q4-h64x
OpenEXR (PyPI) Vendor— Affected 3.4.0 to before 3.4.9 Fixed in 3.4.9 Patch available GHSA-p8xc-w3q4-h64x

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
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 3.4.9	Vulnerable	Academy 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 3.4.9 Vulnerable ·Academy Software Foundation

Remediation

Fix · CNA openexr (AcademySoftwareFoundation) Fixed in 3.2.7, 3.3.9, 3.4.9
Fix · GHSA-p8xc-w3q4-h64x OpenEXR (PyPI) Fixed in 3.2.7 Advisory →
Fix · GHSA-p8xc-w3q4-h64x OpenEXR (PyPI) Fixed in 3.3.9 Advisory →
Fix · GHSA-p8xc-w3q4-h64x OpenEXR (PyPI) Fixed in 3.4.9 Advisory →

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 7	Affected	No fix planned: Out of support scope

Not affected: 3 products

Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9

Timeline

2026-10-02 Threatist record created from CVE-2026-34589
2026-10-03 Alias added: GHSA-p8xc-w3q4-h64x

References

Exploit 1

https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-p8xc-w3q4-h64x

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-34589

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