CVE-2026-34589
Medium
Description
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.
SeverityMedium
CVSS5.0
Exploit probability—
ProductOpenexr
PublishedApr 6, 2026
First seenApr 6, 2026
Weakness typeCWE-190Integer overflowCWE-787Out-of-bounds write
How to fix
Update
- openexr openexr3.2.7, 3.3.9, 3.4.9 or later
- openexr3.2.7, 3.3.9, 3.4.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| openexr openexr | 3.2.0 ≤ v < 3.2.7, 3.3.0 ≤ v < 3.3.9, 3.4.0 ≤ v < 3.4.9 | 3.2.7, 3.3.9, 3.4.9 |
| openexrPyPI | 3.2.0 ≤ v < 3.2.7, 3.3.0 ≤ v < 3.3.9, 3.4.0 ≤ v < 3.4.9 | 3.2.7, 3.3.9, 3.4.9 |
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