# CVE-2026-63420: OpenImageIO heap out-of-bounds read in PSD processing

Source: https://junglewise.ai/threats/cve-2026-63420-openimageio-is-a-toolset-for-reading-writing-and-manipulating  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-63420 · Severity: medium · CVSS 5.5 · Published 2026-09-18

OpenImageIO is a tool for reading and writing image files used in VFX and animation workflows. When processing Photoshop (PSD) files with transparency metadata and certain options enabled, the software can crash due to an out-of-bounds memory access, causing denial of service to applications that depend on it.

Technologies: [Academy Software Foundation OpenImageIO](https://junglewise.ai/threats/technologies/openimageio). Vendors: [Academy Software Foundation](https://junglewise.ai/threats/vendors/academy-software-foundation).

## Quick answers

**Is CVE-2026-63420 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-63420 being exploited in the wild.

**How severe is CVE-2026-63420?** Medium severity, with a CVSS score of 5.5, published 18 September 2026.

**Which products and versions are affected?** Academy Software Foundation OpenImageIO prior to 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1.

**Is there a fix for CVE-2026-63420?** A patch was published on 2026-07-11: Fix merged in commit 4995b25 to guard row interleave bounds on corrupt data Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-63420 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-63420?** Check whether you run Academy Software Foundation OpenImageIO at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap out-of-bounds read occurs in PSDInput::read_native_scanline() when processing indexed PSD files with transparency, triggered when the oiio:rawcolor or psd:rawdata options are enabled. The vulnerability arises because the number of stored channel buffers is fewer than the spec.nchannels value advertised, causing array indexing to exceed allocated memory. The issue can be triggered by opening a maliciously crafted PSD file.

## Affected products

- Academy Software Foundation OpenImageIO prior to 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1

## Timeline

- 2026-09-18: disclosed: CVE-2026-63420 published
- 2026-07-11: patched: Fix merged in commit 4995b25 to guard row interleave bounds on corrupt data

## References

- [https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/4995b25b8216552630e0aee0d8870e0d3aaae7ee](https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/4995b25b8216552630e0aee0d8870e0d3aaae7ee)
- [https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5307](https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5307)

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- [OpenImageIO integer overflow in Cineon codec scanline buffer](https://junglewise.ai/threats/cve-2026-113681-openimageio-before-3-0-20-0-3-1-x-before-3-1-15-0-and-3-2-x)
- [OpenImageIO heap overflow in TIFF CMYK decoding](https://junglewise.ai/threats/cve-2026-67549-openimageio-is-a-toolset-for-reading-writing-and-manipulating)
- [OpenImageIO use-after-scope in multithreaded TIFF decompression](https://junglewise.ai/threats/cve-2026-65970-openimageio-is-a-toolset-for-reading-writing-and-manipulating)
- [OpenImageIO integer overflow in GIF palette splitting](https://junglewise.ai/threats/cve-2026-65969-openimageio-is-a-toolset-for-reading-writing-and-manipulating)
- [OpenImageIO heap overflow in cineon image parsing](https://junglewise.ai/threats/cve-2026-63638-openimageio-is-a-toolset-for-reading-writing-and-manipulating)