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PYSEC-2026-1606

LowCVSS 2 / 10
Published Jul 7, 2026·Last modified Jul 7, 2026
Affected Components(1)
PyPI logomaterialx
1.39.2 – 1.39.3
Description

Summary

When parsing shader nodes in a MTLX file, the MaterialXCore code accesses a potentially null pointer, which can lead to crashes with maliciously crafted files.

Details

In src/MaterialXCore/Material.cpp, in function getShaderNodes, the following code fetches the output nodes for a given nodegraph input node:

// SNIP...
        else if (input->hasNodeGraphString())
        {
            // Check upstream nodegraph connected to the input.
            // If no explicit output name given then scan all outputs on the nodegraph.
            ElementPtr parent = materialNode->getParent();
            NodeGraphPtr nodeGraph = parent->getChildOfType<NodeGraph>(input->getNodeGraphString());
            if (!nodeGraph)
            {
                continue;
            }
            vector<OutputPtr> outputs;
            if (input->hasOutputString())
            {
                outputs.push_back(nodeGraph->getOutput(input->getOutputString())); // <--- null ptr is returned
            }
            else
            {
                outputs = nodeGraph->getOutputs();
            }
            for (OutputPtr output : outputs)
            {
                NodePtr upstreamNode = output->getConnectedNode(); // <--- CRASHES HERE
                if (upstreamNode && !shaderNodeSet.count(upstreamNode))
                {
                    if (!target.empty() && !upstreamNode->getNodeDef(target))
                    {
                        continue;
                    }
                    shaderNodeVec.push_back(upstreamNode);
                    shaderNodeSet.insert(upstreamNode);
                }
            }
        }
    }
// SNIP...

The issues arise because the nodeGraph->getOutput(input->getOutputString()) call can return a null pointer, therefore when trying to call output->getConnectedNode(), this results in a crash .

PoC

Please download nullptr_getshadernodes.mltx from the following link:

https://github.com/ShielderSec/poc/tree/main/CVE-2025-53010

build/bin/MaterialXView --material nullptr_getshadernodes.mtlx

Impact

An attacker could intentionally crash a target program that uses OpenEXR by sending a malicious MTLX file.

Risk Scores
Base Score
2.0

The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
1.2

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS
0.46%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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