OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1, An uncompressed 16-bit iff image with a z-buffer makes iffinput::readimg() allocate a temporary scanline from m_header.rgba_count but copy from it using m_header.pixel_bytes(), whose stride also includes z-buffer bytes. the oversized memcpy reads beyond the temporary heap buffer and copies adjacent memory into the output image, resulting in a crash or disclosure of adjacent heap data. The affected implementation is identified by src/iff.imageio/iffinput.cpp, IffInput::readimg(), m_header.rgba_count, and m_header.pixel_bytes(), which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1.
History

Tue, 29 Sep 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Openimageio
Openimageio openimageio
CPEs cpe:2.3:a:openimageio:openimageio:*:*:*:*:*:*:*:*
cpe:2.3:a:openimageio:openimageio:3.2.0.0:dev:*:*:*:*:*:*
cpe:2.3:a:openimageio:openimageio:3.2.0.2:dev:*:*:*:*:*:*
Vendors & Products Openimageio
Openimageio openimageio

Sat, 19 Sep 2026 22:30:00 +0000

Type Values Removed Values Added
First Time appeared Academysoftwarefoundation
Academysoftwarefoundation openimageio
Vendors & Products Academysoftwarefoundation
Academysoftwarefoundation openimageio

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 18 Sep 2026 15:45:00 +0000

Type Values Removed Values Added
Description OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1, An uncompressed 16-bit iff image with a z-buffer makes iffinput::readimg() allocate a temporary scanline from m_header.rgba_count but copy from it using m_header.pixel_bytes(), whose stride also includes z-buffer bytes. the oversized memcpy reads beyond the temporary heap buffer and copies adjacent memory into the output image, resulting in a crash or disclosure of adjacent heap data. The affected implementation is identified by src/iff.imageio/iffinput.cpp, IffInput::readimg(), m_header.rgba_count, and m_header.pixel_bytes(), which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1.
Title OpenImageIO: Heap-buffer-overread in IffInput::readimg() when ZBUFFER flag is set
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-09-18T15:33:22.599Z

Updated: 2026-09-18T17:41:48.491Z

Reserved: 2026-07-07T18:49:15.607Z

Link: CVE-2026-59956

cve-icon Vulnrichment

Updated: 2026-09-18T17:41:42.807Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-18T16:17:07.290

Modified: 2026-09-29T18:56:57.197

Link: CVE-2026-59956

cve-icon Redhat

No data.