Answer in brief
CVE-2026-63638 records a High severity (CVSS 8.3) vulnerability in OpenImageIO: Cineon invalid bit depth heap out-of-bounds write. 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 8.3. 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 | <3.0.21.0 || >=3.1.0.0 <3.1.16.0 || >=3.2.0.0-dev <3.2.0.3-beta1 | 3.0.21.0, 3.1.16.0, 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 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1, A crafted cineon image can declare unsupported component bit depth 26. cineoninput::open() maps it to a 32-bit imagespec, but libcineon maps the unsupported depth to an 8-byte value, so cineoninput::read_native_scanline() causes attacker-controlled data to be written beyond the 4-byte-per-pixel caller buffer, resulting in a heap out-of-bounds write and memory corruption. The affected implementation is identified by src/cineon.imageio/cineoninput.cpp, CineonInput::open(), CineonInput::read_native_scanline(), ComponentDataSize(), bit depth 26, and ImageSpec, 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.
Quoted source text, attributed separately from HOL analysis.