# CVE-2026-63635: OpenImageIO out-of-bounds read in PSD parser

Source: https://junglewise.ai/threats/cve-2026-63635-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-2026-63635 · Severity: medium · CVSS 5.5 · Published 2026-09-18

OpenImageIO is a library used in animation and VFX production to read and write image files. A flaw in its PSD (Photoshop) file parser allows an attacker to craft a malicious image file that, when processed with certain options enabled, can cause the application to read memory outside its intended bounds or trigger an unexpected memory allocation, leading to potential denial of service.

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-2026-63635 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-63635 being exploited in the wild.

**How severe is CVE-2026-63635?** Medium severity, with a CVSS score of 5.5, published 18 September 2026.

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

**Is there a fix for CVE-2026-63635?** A patch was published on 2026-07-04. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-63635 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-63635?** 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 crafted PSD file with an invalid color_mode value bypasses validation when the oiio:RawColor or psd:RawData options are enabled, allowing the attacker-controlled value to be used as an index into fixed-size color-mode lookup tables in psdinput::setup(). This results in a global out-of-bounds read and potentially unbounded or bogus memory allocation. The vulnerability is patched by validating the color_mode before the RawColor early return path executes.

## Affected products

- Academy Software Foundation OpenImageIO before 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1

## Timeline

- 2026-07-04: patched
- 2026-09-18: disclosed

## References

- [https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/50481b0f90932a4675f65f3cc26407139cb9e20e](https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/50481b0f90932a4675f65f3cc26407139cb9e20e)
- [https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5282](https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5282)

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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)