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Prevent Saxon URL access, avoids XXE vulnerabilities #16

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Nov 13, 2025
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Prevent Saxon URL access, avoids XXE vulnerabilities #16

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2 changes: 2 additions & 0 deletions src/peppol_py/validation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,8 @@ def validate_peppol_document(
# only works with XSLT 1.0, and the Schematron is written in XSLT
# 2.0
with PySaxonProcessor(license=False) as proc:
# Prevent XXE: disallow access to any type of URL
proc.set_configuration_property("http://saxon.sf.net/feature/allowedProtocols", "")
for validation_xsl_file in schematron_xsls:
if not os.path.exists(validation_xsl_file):
# Resolve internal files
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