OpenImageIO: Cineon invalid bit depth heap out-of-bounds write
Summary
| CVE | CVE-2026-63638 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-18 16:17:08 UTC |
| Updated | 2026-09-29 18:55:45 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 8.3 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H
EPSS: 0.004460000 probability, percentile 0.363500000 (date 2026-09-29)
Problem Types: CWE-787 | CWE-787 CWE-787: Out-of-bounds Write
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 8.3 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H |
| 3.1 | CNA | DECLARED | 8.3 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
RequiredScope
UnchangedConfidentiality
LowIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Openimageio | Openimageio | All | All | All | All |
| Application | Openimageio | Openimageio | 3.2.0.0 | dev | All | All |
| Application | Openimageio | Openimageio | 3.2.0.2 | dev | All | All |
| Application | Openimageio | Openimageio | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | AcademySoftwareFoundation | OpenImageIO | affected < 3.0.21.0 | Not specified |
| CNA | AcademySoftwareFoundation | OpenImageIO | affected >= 3.1.0.0, < 3.1.16.0 | Not specified |
| CNA | AcademySoftwareFoundation | OpenImageIO | affected >= 3.2.0.0-dev, < 3.2.0.3-beta1 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.16.0 | [email protected] | github.com | Release Notes |
| github.com/AcademySoftwareFoundation/OpenImageIO/pull/5283 | [email protected] | github.com | Issue Tracking, Patch |
| github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.0.21.0 | [email protected] | github.com | Release Notes |
| github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHS... | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | github.com | Exploit, Mitigation, Vendor Advisory |
| github.com/AcademySoftwareFoundation/OpenImageIO/commit/6f2b2e85b3b3933c... | [email protected] | github.com | Patch |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.