Harden Jackson XML unmarshalling against XXE explicitly#1312
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Build the XmlMapper on an XmlFactory backed by an XMLInputFactory with SUPPORT_DTD and IS_SUPPORTING_EXTERNAL_ENTITIES disabled. Jackson's XML defaults already reject DTDs/external entities, but configuring it explicitly keeps the protection from depending on the defaults of whichever StAX provider happens to be on the classpath. Add a regression test asserting that XML containing a DOCTYPE declaration is rejected. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Build the XmlMapper on an XmlFactory backed by an XMLInputFactory with SUPPORT_DTD and IS_SUPPORTING_EXTERNAL_ENTITIES disabled. Jackson's XML defaults already reject DTDs/external entities, but configuring it explicitly keeps the protection from depending on the defaults of whichever StAX provider happens to be on the classpath.
Add a regression test asserting that XML containing a DOCTYPE declaration is rejected.