CVE-2026-34588

Description

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.

References

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34588.json

https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-588r-cr5c-w6hf

https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9

https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9

https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7

https://bugzilla.redhat.com/show_bug.cgi?id=2455408

https://access.redhat.com/security/cve/CVE-2026-34588

https://access.redhat.com/errata/RHSA-2026:30089

https://access.redhat.com/errata/RHSA-2026:30088

https://access.redhat.com/errata/RHSA-2026:30087

https://access.redhat.com/errata/RHSA-2026:30078

https://access.redhat.com/errata/RHSA-2026:19587

https://access.redhat.com/errata/RHSA-2026:19359

https://access.redhat.com/errata/RHSA-2026:19146

https://access.redhat.com/errata/RHSA-2026:17660

https://access.redhat.com/errata/RHSA-2026:17659

https://access.redhat.com/errata/RHSA-2026:17658

https://access.redhat.com/errata/RHSA-2026:17656

https://access.redhat.com/errata/RHSA-2026:15888

https://access.redhat.com/errata/RHSA-2026:15887

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS