{"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"}}]}}