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PYSEC-2026-1607

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 source/MaterialXCore/Material.cpp, the following code extracts the output nodes for a given implementation graph:

   InterfaceElementPtr impl = materialNodeDef->getImplementation();
            if (impl && impl->isA<NodeGraph>())
            {
                NodeGraphPtr implGraph = impl->asA<NodeGraph>();
                for (OutputPtr defOutput : materialNodeDef->getOutputs())
                {
                    if (defOutput->getType() == MATERIAL_TYPE_STRING)
                    {
                        OutputPtr implGraphOutput = implGraph->getOutput(defOutput->getName());
                        for (GraphIterator it = implGraphOutput->traverseGraph().begin(); it != GraphIterator::end(); ++it)
                        {
                            ElementPtr upstreamElem = it.getUpstreamElement();
                            if (!upstreamElem)
                            {
                                it.setPruneSubgraph(true);
                                continue;
                            }
                            NodePtr upstreamNode = upstreamElem->asA<Node>();
                            if (upstreamNode && upstream

However, when defining the implGraphOutput variable by getting the output node, the code doesn't check whether its value is null before accessing its iterator traverseGraph(). This leads to a potential null pointer dereference.

PoC

Please download nullptr_implgraph.mtlx from the following link:

https://github.com/ShielderSec/poc/tree/main/CVE-2025-53011

build/bin/MaterialXView --material nullptr_implgraph.mtlx

Impact

An attacker could intentionally crash a target program that uses MaterialX 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
0.52%

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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