Bug 2538207 (CVE-2026-63422)

Summary: CVE-2026-63422 OpenImageIO: OpenImageIO: Heap out-of-bounds write can lead to arbitrary code execution
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in OpenImageIO. When processing specially crafted tiled OpenEXR images, where the image width is not a multiple of its tile width, a heap out-of-bounds write can occur. This vulnerability arises from incorrect calculation of scanline stride during tile reading, leading to memory corruption. A remote attacker could exploit this flaw by providing a malicious image, potentially leading to a denial of service or arbitrary code execution.
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Bug Depends On: 2539176, 2539178, 2539180    
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Description OSIDB Bzimport 2026-09-22 17:25:48 UTC 
OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1, A valid tiled openexr image whose width is not a multiple of its tile width can trigger an overflow when a caller reads a partial edge-tile rectangle. openexrinput::read_native_tiles() copies each row into the caller buffer using the padded whole-tile scanline_stride rather than user_scanline_bytes for the requested rectangle, resulting in a heap out-of-bounds write and memory corruption. The affected implementation is identified by src/openexr.imageio/exrinput.cpp, OpenEXRInput::read_native_tiles(), partial edge tile, user_scanline_bytes, and scanline_stride, which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1.