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XStream is software for serializing Java objects to XML and back again. A vulnerability in XStream versions prior to 1.4.17 may allow a remote attacker has sufficient rights to execute commands of the host only by manipulating the processed input stream. No user who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types is affected. The vulnerability is patched in version 1.4.17.
Use CWE-94, Xstream vendor hub and Xstream product page to widen CVE-2021-29505 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2021-39152, CVE-2021-39150 and CVE-2021-39154 for nearby disclosures in the same product family.