CVE-2026-59181: Openimageio

Medium severity, CVSS 6.1. EPSS: 0.2% chance of exploitation in the next 30 days.

OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1, A crafted cineon file can supply a numberofelements value greater than the format maximum of eight. cineoninput::open() uses that unchecked value as the loop bound while filling the fixed strings[8] array, writing pointers beyond the stack buffer and into adjacent state, resulting in memory corruption and denial of service. The affected implementation is identified by src/cineon.imageio/cineoninput.cpp, CineonInput::open(), numberOfElements, and strings[8], which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1.

Affected products

• Openimageio Openimageio: before 3.0.20.0 (fixed in 3.0.20.0); from 3.1.0.0, up to and including 3.1.15.0; version 3.2.0.0 only; version 3.2.0.2 only

Published 2026-09-18. Last modified 2026-09-29.