Executive brief
OpenImageIO is a library used by visual effects and animation software to process various image file formats. A vulnerability in how it handles TGA image files could allow a specially crafted image to crash the application using the library. This could lead to a denial-of-service, interrupting production workflows or causing data loss in unsaved projects.
Technical details
An integer wraparound vulnerability exists in TGAInput::decode_pixel within OpenImageIO. The bounds check for palette access performs 32-bit unsigned arithmetic (k + palbytespp). When k is a large value such as 0xFFFFFFFC and palbytespp is 4, the result wraps to 0, bypassing the check against palette_alloc_size. The subsequent memory access uses the original large value of k as an index, resulting in an out-of-bounds read of approximately 4GB past the buffer, causing a segmentation fault (SEGV). This issue is triggered by processing a malformed TGA file with a crafted palette index. The vulnerability 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 advisory GHSA-mq8j-73c4-cr55 published
- 2026-05-14: disclosed: CVE-2026-43996 published