Vulnerability Details CVE-2026-63638
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 crafted cineon image can declare unsupported component bit depth 26. cineoninput::open() maps it to a 32-bit imagespec, but libcineon maps the unsupported depth to an 8-byte value, so cineoninput::read_native_scanline() causes attacker-controlled data to be written beyond the 4-byte-per-pixel caller buffer, resulting in a heap out-of-bounds write and memory corruption. The affected implementation is identified by src/cineon.imageio/cineoninput.cpp, CineonInput::open(), CineonInput::read_native_scanline(), ComponentDataSize(), bit depth 26, and ImageSpec, 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 36.4%
CVSS Severity
CVSS v3 Score 8.3
Products affected by CVE-2026-63638
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cpe:2.3:a:openimageio:openimageio:3.1.0.0
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cpe:2.3:a:openimageio:openimageio:3.1.10.0
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cpe:2.3:a:openimageio:openimageio:3.1.11.0
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cpe:2.3:a:openimageio:openimageio:3.1.12.0
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cpe:2.3:a:openimageio:openimageio:3.1.12.1
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cpe:2.3:a:openimageio:openimageio:3.1.13.0
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cpe:2.3:a:openimageio:openimageio:3.1.13.1
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cpe:2.3:a:openimageio:openimageio:3.1.14.0
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cpe:2.3:a:openimageio:openimageio:3.1.14.1
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cpe:2.3:a:openimageio:openimageio:3.1.15.0
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cpe:2.3:a:openimageio:openimageio:3.1.16.0
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cpe:2.3:a:openimageio:openimageio:3.1.4.0
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cpe:2.3:a:openimageio:openimageio:3.1.5.0
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cpe:2.3:a:openimageio:openimageio:3.1.6.0
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cpe:2.3:a:openimageio:openimageio:3.1.6.1
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cpe:2.3:a:openimageio:openimageio:3.1.6.2
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cpe:2.3:a:openimageio:openimageio:3.1.7.0
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cpe:2.3:a:openimageio:openimageio:3.1.8.0
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cpe:2.3:a:openimageio:openimageio:3.1.9.0