XStream before version 1.4.14 is vulnerable to Remote Code Execution.The vulnerability may allow a remote attacker to run arbitrary shell commands only by manipulating the processed input stream. Only users who rely on blocklists are affected. Anyone using XStream's Security Framework allowlist is not affected. The linked advisory provides code workarounds for users who cannot upgrade. The issue is fixed in version 1.4.14.
Use CWE-78, Xstream vendor hub and Xstream product page to widen CVE-2020-26217 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.