Bug 2538509 (CVE-2026-63420)

Summary: CVE-2026-63420 OpenImageIO: OpenImageIO: Denial of Service due to out-of-bounds read in PSD image processing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in OpenImageIO. When processing an indexed Photoshop Document (PSD) image containing transparency metadata with oiio:rawcolor or psd:rawdata enabled, the interleave_row function attempts to read data beyond the bounds of allocated memory. This heap out-of-bounds read can lead to a process crash, resulting in a Denial of Service (DoS).
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Bug Depends On: 2539172, 2539173, 2539174    
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Description OSIDB Bzimport 2026-09-22 18:54:59 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, An indexed psd with transparency metadata creates fewer stored channel_buffers than the spec.nchannels value advertised by the rawcolor path. when oiio:rawcolor or psd:rawdata is enabled, psdinput::read_native_scanline() passes spec.nchannels to psdinput::interleave_row(), which indexes beyond channel_buffers, resulting in a heap out-of-bounds read and process crash. The affected implementation is identified by src/psd.imageio/psdinput.cpp, PSDInput::read_native_scanline(), PSDInput::interleave_row(), oiio:RawColor, psd:RawData, channel_buffers, and spec.nchannels, 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.