CVE-2026-59956

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Source
https://cve.org/CVERecord?id=CVE-2026-59956
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59956.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-59956
Aliases
  • GHSA-hjfv-gvxc-qgvh
Downstream
Published
2026-09-18T15:33:22Z
Modified
2026-09-20T14:24:17Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H CVSS Calculator
Summary
OpenImageIO: Heap-buffer-overread in IffInput::readimg() when ZBUFFER flag is set
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59956.json"
}
References

Affected packages

Git / github.com/academysoftwarefoundation/openimageio

Affected ranges

Type
GIT
Repo
https://github.com/academysoftwarefoundation/openimageio
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Introduced
a0940a9f1e4a8ff20edc9d550a4dea4723d1aa58
Fixed
49696331774f2da1f136c4217e23c1e4d920a376
Fixed
cbe57bc005678ca310835473568121719861734c
Fixed
45414c1aedcd3cc98244b4c5802ec53e91976f70
Fixed
f01bd16764b2a06f372899e3e302280a7f9c8c02
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.0.20.0"
        },
        {
            "introduced": "3.1.0.0"
        },
        {
            "fixed": "3.1.15.0"
        },
        {
            "introduced": "3.2.0.0-dev"
        },
        {
            "fixed": "3.2.0.3-beta1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

Arnold-3.*
Arnold-3.4.72.0
Release-0.*
Release-0.10.0
Release-1.*
Release-1.0.0
Release-1.0.1
Release-1.1.0
Release-1.1.0-beta1
Release-1.1.0-beta2
Release-1.1.0-beta3
Release-1.1.0-beta4
Release-1.1.1
Release-1.3.0-dev
Release-1.3.1-dev
Release-1.3.2-dev
Release-1.3.3-dev
Release-1.3.4-dev
Release-1.3.5
Release-1.3.5-dev
Release-1.3.6-dev
Release-1.4.1dev
Release-1.4.2dev
Release-1.4.3dev
Release-1.4.4dev
Release-1.4.5dev
Release-1.4.6RC1
Release-1.5.0dev
Release-1.5.1dev
Release-1.5.2dev
Release-1.5.3dev
Release-1.5.4dev-pre-SIMD
Release-1.5.5dev
Release-1.5.6dev
Release-1.5.7dev
Release-1.6.1dev
Release-1.6.2dev
Release-1.6.3dev
Release-1.6.4dev
Release-1.6.6beta
Release-1.7.0dev
Release-1.7.1dev
Release-1.7.2dev
Release-1.7.3dev
Release-1.7.4dev
Release-1.7.5beta
Release-1.7.6RC1
Release-1.8.0dev
Release-1.8.1dev
Release-1.8.2dev
Release-1.8.3dev
Release-1.8.4dev
Release-1.9.1dev
Release-1.9.2dev
Release-1.9.3dev
Release-1.9.4dev
Release-2.*
Release-2.0.0-beta1
Release-2.0.1-RC1
Release-2.1.0-dev
Release-2.1.1-dev
Release-2.1.2-dev
Release-2.1.3-dev
Release-2.1.4.0-dev
Release-2.1.5.0-dev
Release-2.1.7-beta
Release-2.1.8.0-RC1
Release-2.2.0.0-dev
Release-2.2.1.0-dev
Release-2.2.1.1-dev
Release-2.2.2.0-dev
Release-2.2.3.0-dev
Release-2.3.0.0-dev
Release-2.3.1.0-dev
Release-2.3.2.0-dev
Release-2.3.3.0-dev
Release-2.3.4.0-dev
arnold-3.*
arnold-3.4.71.0
spi-Arn3.*
spi-Arn3.4.71.0
spi-Arn3.4.72.0
spi-Arn3.4.73.6
spi-Arn3.4.73.7
spi-Arn3.5.0.0
spi-Arn3.5.10.0
spi-Arn3.5.11.0
spi-Arn3.5.12.0
spi-Arn3.5.13.1
spi-Arn3.5.14.0
spi-Arn3.5.16.0
spi-Arn3.5.2.0
spi-Arn3.5.24.0
spi-Arn3.5.25.0
spi-Arn3.5.26.0
spi-Arn3.5.28.0
spi-Arn3.5.31.0
spi-Arn3.5.35.0
spi-Arn3.5.37.0
spi-Arn3.5.41.0
spi-Arn3.5.45.0
spi-Arn3.5.45.1
spi-Arn3.5.48.0
spi-Arn3.5.5.0
spi-Arn3.5.50.0
spi-Arn3.5.66.0
spi-Arn3.5.68.0
spi-Arn3.5.75.0
spi-Arn3.5.8.0
spi-Arn3.5.82.0
spi-Arn3.5.90.0
spi-Arn3.5.91.0
spi-Arn3.5.93.10
spi-Arn3.6.18.0
spi-Arn3.6.21.3
spi-Arn3.6.27.0
spi-Arn3.6.33.4
spi-Arn3.6.36.0
spi-Arn3.6.64.6
spi-Arn3.6.69.3
spi-Arn3.6.7.1
spi-Arn3.6.72.1
spi-Arn3.7.23.3
spi-Arn3.7.25.0
spi-Arn3.7.42.0
Other
spi-SpComp2-v20
spi-SpComp2-v9
spi-spcomp2-release-38.*
spi-spcomp2-release-38.0
spi-spcomp2-release-39.*
spi-spcomp2-release-39.1
spi-spcomp2-release-41.*
spi-spcomp2-release-41.0
spi-spcomp2-release-42.*
spi-spcomp2-release-42.0-rhel7
spi-spcomp2-release-43.*
spi-spcomp2-release-43.0
spi-spcomp2-release-44.*
spi-spcomp2-release-44.0
spi-spcomp2-release-44.1
spi-spcomp2-release-44.2
spi-spcomp2-release-45.*
spi-spcomp2-release-45.0
spi-spcomp2-release-45.1
spi-spcomp2-release-45.3
spi-spcomp2-release-45.4
spi-spcomp2-release-47.*
spi-spcomp2-release-47.0
spi-spcomp2-release-48.*
spi-spcomp2-release-48.0
spi-spcomp2-release-49.*
spi-spcomp2-release-49.1
spi-v7-Arn3.*
spi-v7-Arn3.4.73.3
spi-v8-Arn3.*
spi-v8-Arn3.4.73.6
spiArn-3.*
spiArn-3.6.74.0
spiArn-3.6.84.0
spiArn-3.6.86.0
spiArn-3.6.94.0
spiArn3.*
spiArn3.5.45.0
spiArn3.5.45.1
spiArn3.5.48.0
spiArn3.5.50.0
spiArn3.5.66.0
spiArn3.5.68.0
spiArn3.5.75.0
spiArn3.5.82.0
v2.*
v2.3.5.0-dev
v2.3.6.0-dev
v2.4.0.0-dev
v2.4.0.1-dev
v2.4.0.2-dev
v2.4.0.3-dev
v2.4.1.1-dev
v2.4.2.0-dev
v2.4.2.1-dev
v2.4.2.2-dev
v2.5.0.0-dev
v2.5.2.0-dev
v2.6.1.0-dev
v2.6.2.0-dev
v2.6.5.0-dev
v3.*
v3.0.0.0-beta1
v3.0.0.1-beta2
v3.0.0.2-RC1
v3.0.0.3
v3.0.1.0
v3.0.10.0
v3.0.10.1
v3.0.11.0
v3.0.12.0
v3.0.13.0
v3.0.14.0
v3.0.15.0
v3.0.16.0
v3.0.17.0
v3.0.18.0
v3.0.18.1
v3.0.19.0
v3.0.19.1
v3.0.2.0
v3.0.3.0
v3.0.3.1
v3.0.4.0
v3.0.5.0
v3.0.6.0
v3.0.6.1
v3.0.7.0
v3.0.8.0
v3.0.8.1
v3.0.9.0
v3.1.10.0
v3.1.11.0
v3.1.12.0
v3.1.13.0
v3.1.13.1
v3.1.14.0
v3.1.14.1
v3.1.4.0-beta
v3.1.5.0-beta2
v3.1.6.0-rc1
v3.1.6.1
v3.1.6.2
v3.1.7.0
v3.1.8.0
v3.1.9.0
v3.2.0.0-dev
v3.2.0.2-dev

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59956.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "199998592424452235091401427862686671310",
            "length": 8511
        },
        "id": "CVE-2026-59956-3b5a40cc",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/academysoftwarefoundation/openimageio/commit/f01bd16764b2a06f372899e3e302280a7f9c8c02",
        "target": {
            "file": "src/iff.imageio/iffinput.cpp",
            "function": "IffInput::readimg"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
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            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-59956-b28da2f4",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/academysoftwarefoundation/openimageio/commit/f01bd16764b2a06f372899e3e302280a7f9c8c02",
        "target": {
            "file": "src/iff.imageio/iffinput.cpp"
        }
    }
]
vanir_signatures_modified 
"2026-09-20T14:24:17Z"