{"id":"PYSEC-2026-1606","summary":"MaterialX Null Pointer Dereference in getShaderNodes due to Unchecked nodeGraph-\u003egetOutput return","details":"### Summary\n\nWhen parsing shader nodes in a MTLX file, the MaterialXCore code accesses a potentially null pointer, which can lead to crashes with maliciously crafted files.\n\n### Details\n\nIn `src/MaterialXCore/Material.cpp`, in function `getShaderNodes`, the following code fetches the output nodes for a given `nodegraph` input node:\n\n```cpp\n// SNIP...\n        else if (input-\u003ehasNodeGraphString())\n        {\n            // Check upstream nodegraph connected to the input.\n            // If no explicit output name given then scan all outputs on the nodegraph.\n            ElementPtr parent = materialNode-\u003egetParent();\n            NodeGraphPtr nodeGraph = parent-\u003egetChildOfType\u003cNodeGraph\u003e(input-\u003egetNodeGraphString());\n            if (!nodeGraph)\n            {\n                continue;\n            }\n            vector\u003cOutputPtr\u003e outputs;\n            if (input-\u003ehasOutputString())\n            {\n                outputs.push_back(nodeGraph-\u003egetOutput(input-\u003egetOutputString())); // \u003c--- null ptr is returned\n            }\n            else\n            {\n                outputs = nodeGraph-\u003egetOutputs();\n            }\n            for (OutputPtr output : outputs)\n            {\n                NodePtr upstreamNode = output-\u003egetConnectedNode(); // \u003c--- CRASHES HERE\n                if (upstreamNode && !shaderNodeSet.count(upstreamNode))\n                {\n                    if (!target.empty() && !upstreamNode-\u003egetNodeDef(target))\n                    {\n                        continue;\n                    }\n                    shaderNodeVec.push_back(upstreamNode);\n                    shaderNodeSet.insert(upstreamNode);\n                }\n            }\n        }\n    }\n// SNIP...\n```\n\nThe issues arise because the `nodeGraph-\u003egetOutput(input-\u003egetOutputString())` call can return a null pointer, therefore when trying to call `output-\u003egetConnectedNode()`, this results in a crash    .\n\n\n### PoC\n\nPlease download `nullptr_getshadernodes.mltx` from the following link:\n\nhttps://github.com/ShielderSec/poc/tree/main/CVE-2025-53010\n\n`build/bin/MaterialXView --material nullptr_getshadernodes.mtlx`\n\n\n### Impact\n\nAn attacker could intentionally crash a target program that uses OpenEXR by sending a malicious MTLX file.","aliases":["CVE-2025-53010","GHSA-3jhf-gxhr-q4cx"],"modified":"2026-07-07T17:46:15.445230359Z","published":"2026-07-07T16:02:59.437613Z","references":[{"type":"WEB","url":"https://github.com/AcademySoftwareFoundation/MaterialX/security/advisories/GHSA-3jhf-gxhr-q4cx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-53010"},{"type":"WEB","url":"https://github.com/AcademySoftwareFoundation/MaterialX/commit/e13344ba13326869d7820b444705f24d56fab73d"},{"type":"PACKAGE","url":"https://github.com/AcademySoftwareFoundation/MaterialX"},{"type":"WEB","url":"https://github.com/ShielderSec/poc/tree/main/CVE-2025-53010"},{"type":"PACKAGE","url":"https://pypi.org/project/materialx"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-3jhf-gxhr-q4cx"}],"affected":[{"package":{"name":"materialx","ecosystem":"PyPI","purl":"pkg:pypi/materialx"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.39.2"},{"fixed":"1.39.3"}]}],"versions":["1.39.2"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/materialx/PYSEC-2026-1606.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"}]}