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Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M

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

Medium 5.5

In plain English

A medium-severity out-of-bounds read in OpenImageIO from AcademySoftwareFoundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 89.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12openimageiono fix listedDEBIAN-CVE-2026-63420
Debian:13openimageiono fix listedDEBIAN-CVE-2026-63420
Debian:14openimageio3.1.18.0+dfsg-2DEBIAN-CVE-2026-63420
Ubuntu:22.04:LTSopenimageiono fix listedUBUNTU-CVE-2026-63420
Ubuntu:26.10openimageiono fix listedUBUNTU-CVE-2026-63420

Affected products (as reported)

VendorProductVersions
AcademySoftwareFoundation OpenImageIO < 3.0.21.0>= 3.1.0.0, < 3.1.16.0>= 3.2.0.0-dev, < 3.2.0.3-beta1

Weakness: CWE-125, CWE-129 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References