Executive brief
OpenImageIO is a widely used library for processing image files in the visual effects and animation industries. A vulnerability in how it handles specific image formats allows a specially crafted image file to crash the software or potentially allow unauthorized access to data. This could disrupt production pipelines or compromise systems that automatically process user-uploaded images.
Technical details
A signed 32-bit integer overflow exists in the ConvertCbYCrYToRGB() function within the DPX 4:2:2 decoder of OpenImageIO. The vulnerability is triggered when the pixel-loop index expression 'i * 3' exceeds the maximum value for a 32-bit signed integer (INT_MAX), which occurs when processing very large images (where Width * Height exceeds approximately 715 million pixels). This overflow results in a large negative pointer offset during an output buffer write operation, leading to a heap-based out-of-bounds write and a subsequent segmentation fault. An attacker can exploit this by providing a maliciously crafted DPX image file. The issue is fixed in versions 3.0.18.0 and 3.1.13.0.
Affected products
- Academy Software Foundation OpenImageIO < 3.0.18.0, < 3.1.13.0, <= 3.2.0.1-dev
Timeline
- 2026-05-03: advisory: GitHub security advisory published by maintainers
- 2026-05-14: disclosed: CVE-2026-43908 published