# CVE-2026-63419: OpenImageIO heap out-of-bounds write in IFF decoder

Source: https://junglewise.ai/threats/cve-2026-63419-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-2026-63419 · Severity: high · CVSS 7.8 · Published 2026-09-18

OpenImageIO is a library for reading and writing image files used in VFX and animation production. A flaw in the IFF image format decoder can allow attackers to cause memory corruption by providing a specially crafted IFF image file, potentially leading to 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-2026-63419 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-63419 being exploited in the wild.

**How severe is CVE-2026-63419?** 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, before 3.1.16.0, before 3.2.0.3-beta1.

**Is there a fix for CVE-2026-63419?** A patch was published on 2026-07-02. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-63419 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-63419?** 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 write vulnerability exists in iffinput::read_native_tile() due to a mismatch between the public ImageSpec tile bytes (16-bit) and internal pixel size (32-bit) for zbuffer-only tiled IFF images. The decoder copies data using m_header.pixel_bytes() instead of imagespec::tile_bytes(true), and failed reads can leave m_buf nonempty, causing partially initialized data to be written to an undersized caller buffer. This can be triggered by providing a malicious IFF file without authentication or special privileges.

## Affected products

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

## Timeline

- 2026-09-18: disclosed
- 2026-07-02: patched

## References

- [https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/9cda48b150294c7f024e680a6c9b0402e50f4816](https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/9cda48b150294c7f024e680a6c9b0402e50f4816)
- [https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5268](https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5268)

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