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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.

PUBLISHED Reserved 2026-03-30 | Published 2026-04-06 | Updated 2026-04-07 | Assigner GitHub_M




HIGH: 8.4CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-190: Integer Overflow or Wraparound

CWE-787: Out-of-bounds Write

Product status

>= 3.2.0, < 3.2.7
affected

>= 3.3.0, < 3.3.9
affected

>= 3.4.0, < 3.4.9
affected

References

github.com/...penexr/security/advisories/GHSA-p8xc-w3q4-h64x

github.com/...SoftwareFoundation/openexr/releases/tag/v3.2.7

github.com/...SoftwareFoundation/openexr/releases/tag/v3.3.9

github.com/...SoftwareFoundation/openexr/releases/tag/v3.4.9

cve.org (CVE-2026-34589)

nvd.nist.gov (CVE-2026-34589)

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