CVE-2026-34589

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.

Score

CVSS 3.1 8.8 High

Status

Modified - security-advisories@github.com

Published

2026-04-06

Last modified

2026-10-26

Weaknesses

CWE-190, CWE-787

Affected products

• Openexr (Academysoftwarefoundation)
• Openexr (Openexr)
• Enterprise Linux (Redhat)

References

• https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-p8xc-w3q4-h64x
• https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7
• https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9
• https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9
• https://access.redhat.com/security/cve/CVE-2026-34589
• https://bugzilla.redhat.com/show_bug.cgi?id=2455411
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34589.json