CVE-2026-63419: academysoftwarefoundation openimageio Out-of-bounds Write

Vulnerability summary

CVE-2026-63419 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in academysoftwarefoundation openimageio. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.8% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 18-09-2026
   PublishedVulnerability first disclosed.
2. 18-09-2026
   Last modifiedVulnerability information updated.

Description

OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1, A zbuffer-only tiled iff is exposed with a 16-bit public imagespec while the decoder retains a 32-bit internal pixel size. iffinput::read_native_tile() copies according to m_header.pixel_bytes() rather than imagespec::tile_bytes(true), and a failed read can leave m_buf nonempty so a later call copies partially initialized data into the undersized caller buffer, resulting in a heap out-of-bounds write and memory corruption. The affected implementation is identified by src/iff.imageio/iffinput.cpp, IffInput::read_native_tile(), ImageSpec::tile_bytes(true), m_header.pixel_bytes(), ZBUFFER, and m_buf, which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.