CVE-2026-63420: OpenImageIO: PSD RawColor indexed image out-of-bounds read in `interleave_row`

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-09-18 · updated 2026-09-29
Weakness: CWE-125

Description

OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.21.0, 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.

Affected products

OpenImageIO Project OpenImageIO: before 3.0.21.0; from 3.1.0.0 through 3.1.16.0; 3.2.0.0-dev, 3.2.0.2-dev — fixed in 3.0.21.0

How to fix

Upgrade to a fixed version: OpenImageIO Project OpenImageIO 3.0.21.0. Check the vendor advisory for mitigations.

References

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