CVE-2026-34589
OpenEXR: DWA Lossy Decoder Heap Out-of-Bounds Write
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-190 CWE-787 |
| Vendor | academysoftwarefoundation |
| Product | openexr |
| Published | Apr 6, 2026 |
| Last Updated | Jul 15, 2026 |
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Affected Versions
AcademySoftwareFoundation / openexr
>= 3.2.0, < 3.2.7 >= 3.3.0, < 3.3.9 >= 3.4.0, < 3.4.9
References
github.com: https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-p8xc-w3q4-h64x github.com: https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7 github.com: https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9 github.com: https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-34589 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2455411 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34589.json