MaterialX Null Pointer Dereference in MaterialXCore Shader Generation due to Unchecked implGraphOutput
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 && upstreamHowever, 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.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | materialx | >= 1.39.2, < 1.39.3 | 1.39.3 |
Referencias
- https://github.com/AcademySoftwareFoundation/MaterialX/security/advisories/GHSA-7qw8-3vmf-gj32
- https://nvd.nist.gov/vuln/detail/CVE-2025-53011
- https://github.com/AcademySoftwareFoundation/MaterialX/commit/7ac1c71de5187dc29793292b5a8dc6d784192ecf
- https://github.com/AcademySoftwareFoundation/MaterialX
- https://github.com/AcademySoftwareFoundation/MaterialX/releases/tag/v1.39.3
- https://github.com/ShielderSec/poc/tree/main/CVE-2025-53011
- https://pypi.org/project/materialx
- https://github.com/advisories/GHSA-7qw8-3vmf-gj32
- Vector CVSS
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- Debilidad (CWE)
CWE-476- Plataforma
- Python (PyPI)
- Paquete
materialx- Publicada
- 31.07.2025
- Actualizado
- 11.10.2026 13:18
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-1607 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-7qw8-3vmf-gj32 - CC BY 4.0
Historial de vulnerabilidades: materialx
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 4
- Primera → última
- 07.2025 07.2025
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Media 2
- Baja 2
Divulgaciones por año
- 2025: 4
- 2026: 0
-
MaterialX Null Pointer Dereference in MaterialXCore Shader Generation due to Unchecked implGraphOutput esta entrada
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