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PYSEC-2026-1609
materialxSummary
When parsing an MTLX file with multiple nested nodegraph implementations, the MaterialX XML parsing logic can potentially crash due to stack exhaustion.
Details
By specification, multiple kinds of elements in MTLX support nesting other elements, such as in the case of nodegraph elements. Parsing these subtrees is implemented via recursion, and since there is no max depth imposed on the XML document, this can lead to a stack overflow when the library parses an MTLX file with an excessively high number of nested elements.
PoC
Please download the recursion_overflow.mtlx file from the following link:
https://github.com/ShielderSec/poc/tree/main/CVE-2025-53009
build/bin/MaterialXView --material recursion_overflow.mtlx
Impact
An attacker could intentionally crash a target program that uses MaterialX by sending a malicious MTLX file.
The vulnerability can be exploited over the network without needing physical access. 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.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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