Out-of-bounds Read in Academysoftwarefoundation Openimageio
CVE-2026-63420
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (10.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Academysoftwarefoundation Openimageio — versions < 3.0.21.0, >= 3.1.0.0, < 3.1.16.0, >= 3.2.0.0-dev, < 3.2.0.3-beta1
- Openimageio — versions 3.2.0.0, 3.2.0.2
Weakness classification (CWE)
References
- github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-x877-… (Exploit, Vendor Advisory)
- github.com/AcademySoftwareFoundation/OpenImageIO/pull/5307 (Patch, Issue Tracking)
- github.com/AcademySoftwareFoundation/OpenImageIO/commit/4995b25b8216552630e0aee… (Patch)
- github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.0.21.0 (Release Notes)
- github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.16.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-63420?
- CVE-2026-63420 is a medium-severity vulnerability in Academysoftwarefoundation Openimageio, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2026-09-18.
- How severe is CVE-2026-63420?
- Medium severity. CVSS v3 base score is 5.5 out of 10.