OpenEXR: DWA Lossy Decoder Heap Out-of-Bounds Write_CVE-2026-34589

8.4 / 10

HIGH

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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.

Basic Information

ID CVE-2026-34589

Source GitHub_M

Published Apr 6, 2026 at 15:33

Modified Apr 7, 2026 at 13:05

Affected Product

Vendor AcademySoftwareFoundation

Product openexr

Version >= 3.2.0, < 3.2.7

Affected Versions AcademySoftwareFoundation openexr >= 3.2.0, < 3.2.7
AcademySoftwareFoundation openexr >= 3.3.0, < 3.3.9
AcademySoftwareFoundation openexr >= 3.4.0, < 3.4.9

CWE Classification

CWE-190 CWE-787

References

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    "published": "2026-04-06T15:33:03.276Z",
    "modified": "2026-04-07T13:05:41.117Z",
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