{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-59956", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-07T18:49:15.607Z", "datePublished": "2026-09-18T15:33:22.599Z", "dateUpdated": "2026-09-18T17:41:48.491Z"}, "containers": {"cna": {"title": "OpenImageIO: Heap-buffer-overread in IffInput::readimg() when ZBUFFER flag is set", "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "lang": "en", "description": "CWE-125: Out-of-bounds Read", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-hjfv-gvxc-qgvh", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-hjfv-gvxc-qgvh"}, {"name": "https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5251", "tags": ["x_refsource_MISC"], "url": "https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5251"}, {"name": "https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/f01bd16764b2a06f372899e3e302280a7f9c8c02", "tags": ["x_refsource_MISC"], "url": "https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/f01bd16764b2a06f372899e3e302280a7f9c8c02"}, {"name": "https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.0.20.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.0.20.0"}, {"name": "https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.15.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.15.0"}], "affected": [{"vendor": "AcademySoftwareFoundation", "product": "OpenImageIO", "versions": [{"version": "< 3.0.20.0", "status": "affected"}, {"version": ">= 3.1.0.0, < 3.1.15.0", "status": "affected"}, {"version": ">= 3.2.0.0-dev, < 3.2.0.3-beta1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-18T15:33:22.599Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-hjfv-gvxc-qgvh", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-hjfv-gvxc-qgvh", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-18T17:41:21.102766Z", "id": "CVE-2026-59956", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-18T17:41:48.491Z"}}]}}

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{"affected": [{"affectedData": [{"product": "OpenImageIO", "vendor": "AcademySoftwareFoundation", "versions": [{"status": "affected", "version": "< 3.0.20.0"}, {"status": "affected", "version": ">= 3.1.0.0, < 3.1.15.0"}, {"status": "affected", "version": ">= 3.2.0.0-dev, < 3.2.0.3-beta1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-59956", "lastModified": "2026-09-18T18:17:07.990", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-59956", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-18T17:41:21.102766Z", "version": "2.0.3"}}]}, "published": "2026-09-18T16:17:07.290", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/f01bd16764b2a06f372899e3e302280a7f9c8c02"}, {"source": "security-advisories@github.com", "url": "https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5251"}, {"source": "security-advisories@github.com", "url": "https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.0.20.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.15.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-hjfv-gvxc-qgvh"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-hjfv-gvxc-qgvh"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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