Answer in brief
CVE-2026-59956 records a Medium severity (CVSS 6.1) vulnerability in OpenImageIO: Heap-buffer-overread in IffInput::readimg() when ZBUFFER flag is set. The current sources do not mark it as known exploited. The current feed maps AcademySoftwareFoundation/OpenImageIO (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps AcademySoftwareFoundation/OpenImageIO (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:openimageio:openimageio:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:openimageio:openimageio:3.2.0.0:dev:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:openimageio:openimageio:3.2.0.2:dev:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| AcademySoftwareFoundation/OpenImageIOgeneric | <3.0.20.0 || >=3.1.0.0 <3.1.15.0 || >=3.2.0.0-dev <3.2.0.3-beta1 | 3.0.20.0, 3.1.15.0, 3.2.0.3-beta1 |
Published upstream
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 18, 2026
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, 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.
Quoted source text, attributed separately from HOL analysis.