# CVE-2026-63422: OpenImageIO heap overflow in OpenEXR partial tile reading

Source: https://junglewise.ai/threats/cve-2026-63422-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-2026-63422 · Severity: high · CVSS 7.8 · Published 2026-09-18

OpenImageIO is a widely-used image processing library for VFX and animation workflows. A vulnerability in its OpenEXR file reader can cause heap buffer overflow when processing specially crafted tiled EXR images whose width is not a multiple of the tile size, potentially leading to memory corruption, application crashes, or arbitrary code execution.

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-2026-63422 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-63422 being exploited in the wild.

**How severe is CVE-2026-63422?** High severity, with a CVSS score of 7.8, 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-2026-63422?** A patch was published on 2026-07-15: Fix committed to main branch Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-63422 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-63422?** 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

The vulnerability exists in OpenImageIO's read_native_tiles() function, which incorrectly uses tile-padded scanline stride instead of the user's requested rectangle width when copying partial edge tiles, resulting in out-of-bounds heap writes. The flaw affects tiled OpenEXR images with non-tile-aligned dimensions when read_native_tiles() is called. An attacker can craft a malicious EXR file to trigger this overflow; no authentication or special privileges are required, only that the application reads the image via the vulnerable code path.

## Affected products

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

## Timeline

- 2026-07-15: patched: Fix committed to main branch
- 2026-09-18: disclosed

## References

- [https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/7303134f13b0f9dc738b8ecabecd8c9f90cbd4c9](https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/7303134f13b0f9dc738b8ecabecd8c9f90cbd4c9)
- [https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5295](https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5295)

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