23 Oct 2026 15:48:27 UTC
OpenImageIO: Heap-buffer-overread in IffInput::readimg() when ZBUFFER flag is set
cve-program · CVE-2026-59956 · Published
CVE-2026-59956
OpenImageIO: Heap-buffer-overread in IffInput::readimg() when ZBUFFER flag is set
CVSS 3.1 6.1 MEDIUMCheck source for fixed versionsKEV status unknown
cve-program · CVE-2026-59956
PublishedOpenImageIO 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, An uncompressed 16-bit iff image with a z-buffer makes iffinput::readimg() allocate a temporary scanline from m_header.rgba_count but copy from it using m_header.pixel_bytes(), whose stride also includes z-buffer bytes. the oversized memcpy reads beyond the temporary heap buffer and copies adjacent memory into the output image, resulting in a crash or disclosure of adjacent heap data. The affected implementation is identified by src/iff.imageio/iffinput.cpp, IffInput::readimg(), m_header.rgba_count, and m_header.pixel_bytes(), 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.
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