# CVE-2026-59181: OpenImageIO buffer overflow in Cineon image parsing

Source: https://junglewise.ai/threats/cve-2026-59181-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-2026-59181 · Severity: medium · CVSS 6.1 · Published 2026-09-18

OpenImageIO is a media processing library used in film and animation production for reading and writing image files. A crafted Cineon image file can trigger a buffer overflow in the parser, allowing an attacker to corrupt memory and crash the application when processing a malicious file. This could disrupt VFX pipelines or provide a foothold for further exploitation.

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-2026-59181 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-59181 being exploited in the wild.

**How severe is CVE-2026-59181?** Medium severity, with a CVSS score of 6.1, published 18 September 2026.

**Which products and versions are affected?** Academy Software Foundation OpenImageIO prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1.

**Is there a fix for CVE-2026-59181?** A patch was published on 2026-06-27: Fix merged in commit 908f22f5528e88e5e96184c194caa26b54b2b85f Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-59181 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-59181?** 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 stack buffer overflow exists in cineoninput.cpp's CineonInput::open() function, where a user-supplied numberOfElements value from a malicious Cineon file is used as a loop bound without validation against the format's maximum of 8, causing writes beyond the fixed-size strings[8] array. An attacker can craft a Cineon image file with an oversized numberOfElements to trigger memory corruption and denial of service. The vulnerability is fixed by adding bounds checking on the numberOfElements value.

## Affected products

- Academy Software Foundation OpenImageIO prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1

## Timeline

- 2026-09-18: disclosed
- 2026-06-27: patched: Fix merged in commit 908f22f5528e88e5e96184c194caa26b54b2b85f

## References

- [https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/908f22f5528e88e5e96184c194caa26b54b2b85f](https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/908f22f5528e88e5e96184c194caa26b54b2b85f)
- [https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5250](https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5250)

## Related threats

- [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)