CVE-2026-34544
High
Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.8, a crafted B44 or B44A EXR file can cause an out-of-bounds write in any application that decodes it via exr_decoding_run(). Consequences range from immediate crash (most likely) to corruption of adjacent heap allocations (layout-dependent). This issue has been patched in version 3.4.8.
SeverityHigh
CVSS7.3
Exploit probability—
ProductOpenexr
PublishedApr 1, 2026
First seenApr 1, 2026
Weakness typeCWE-190Integer overflowCWE-787Out-of-bounds write
How to fix
Update
- openexr openexr3.2.7, 3.3.9, 3.4.8 or later
- openexr3.4.8 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 < 3.4.8 | 3.2.7, 3.3.9, 3.4.8 |
| openexrPyPI | 3.4.0 ≤ v < 3.4.8, 3.3.0 ≤ v ≤ 3.3.8, 3.2.0 ≤ v ≤ 3.2.6, 3.2.0 ≤ v < 3.4.8 | 3.4.8 |
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