CVE-2026-63638: CWE-787: Out-of-bounds Write in AcademySoftwareFoundation OpenImageIO
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.
AI Analysis
Technical Summary
OpenImageIO versions before 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1 contain a heap out-of-bounds write vulnerability (CWE-787) triggered by a specially crafted cineon image with an unsupported component bit depth of 26. The cineoninput::open() function maps this bit depth to a 32-bit ImageSpec, but libcineon maps it to an 8-byte value, causing cineoninput::read_native_scanline() to write beyond the allocated 4-byte-per-pixel buffer. This results in memory corruption. The vulnerability is located in src/cineon.imageio/cineoninput.cpp within the CineonInput::open(), CineonInput::read_native_scanline(), and ComponentDataSize() functions. The issue has been addressed in OpenImageIO versions 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1.
Potential Impact
Successful exploitation can cause heap memory corruption, potentially leading to denial of service or arbitrary code execution. The CVSS v3.1 score is 8.3 (high), reflecting network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, low confidentiality impact, high integrity impact, and high availability impact.
Mitigation Recommendations
Upgrade OpenImageIO to version 3.0.21.0, 3.1.16.0, or 3.2.0.3-beta1 or later where this vulnerability is fixed. No other mitigation or workaround is specified. Patch status is confirmed fixed in these versions.
CVE-2026-63638: CWE-787: Out-of-bounds Write in AcademySoftwareFoundation OpenImageIO
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 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.
CVSS v3.1
Score 8.3high
Affected software
AcademySoftwareFoundation
OpenImageIO
pkg:github/academysoftwarefoundation/OpenImageIORun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
OpenImageIO versions before 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1 contain a heap out-of-bounds write vulnerability (CWE-787) triggered by a specially crafted cineon image with an unsupported component bit depth of 26. The cineoninput::open() function maps this bit depth to a 32-bit ImageSpec, but libcineon maps it to an 8-byte value, causing cineoninput::read_native_scanline() to write beyond the allocated 4-byte-per-pixel buffer. This results in memory corruption. The vulnerability is located in src/cineon.imageio/cineoninput.cpp within the CineonInput::open(), CineonInput::read_native_scanline(), and ComponentDataSize() functions. The issue has been addressed in OpenImageIO versions 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1.
Potential Impact
Successful exploitation can cause heap memory corruption, potentially leading to denial of service or arbitrary code execution. The CVSS v3.1 score is 8.3 (high), reflecting network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, low confidentiality impact, high integrity impact, and high availability impact.
Mitigation Recommendations
Upgrade OpenImageIO to version 3.0.21.0, 3.1.16.0, or 3.2.0.3-beta1 or later where this vulnerability is fixed. No other mitigation or workaround is specified. Patch status is confirmed fixed in these versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-17T14:11:15.482Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aad608e55bf5e2cf5360fae
Added to database: 09/18/2026, 16:02:22 UTC
Last enriched: 09/18/2026, 16:16:34 UTC
Last updated: 09/18/2026, 22:12:52 UTC
Views: 10
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