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XStream through 1.4.9, when a certain denyTypes workaround is not used, mishandles attempts to create an instance of the primitive type 'void' during unmarshalling, leading to a remote application crash, as demonstrated by an xstream.fromXML("<void/>") call.
Use CWE-20, Redhat vendor hub and Fuse product page to widen CVE-2017-7957 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2025-12543, CVE-2026-28369 and CVE-2026-28368 for nearby disclosures in the same product family.