CVE-2019-17267 identifies a critical Java vulnerability in FasterXML jackson-databind that enables remote code execution through polymorphic typing deserialization flaws affecting versions before 2.9.10 and 2.8.11.5. This vulnerability achieves a maximum CVSS score of 9.8 (Critical severity) with an EPSS score of 78 percentile and 1.2% exploitation probability, indicating high severity with moderate attack prevalence. The vulnerability details reveal a polymorphic typing issue related to net.sf.ehcache.hibernate.EhcacheJtaTransactionManagerLookup that allows attackers to exploit deserialization gadgets in ehcache package classes to achieve remote code execution without authentication. This creates substantial exploit risk for Java applications using jackson-databind for JSON processing, particularly affecting Oracle WebLogic Server and enterprise systems that rely on jackson-databind's polymorphic deserialization capabilities for complex object mapping and data binding operations. The technical root cause lies in jackson-databind's unsafe handling of polymorphic type information during deserialization, where attackers can leverage specific classes like EhcacheJtaTransactionManagerLookup as deserialization gadgets to execute arbitrary code, creating a vector for known exploited vulnerabilities targeting Java applications. The vulnerability specifically targets the interaction between jackson-databind's polymorphic typing system and ehcache hibernate components, allowing malicious JSON payloads to trigger dangerous deserialization paths that bypass normal security controls. Major vendors including Red Hat, Oracle, NetApp, and Debian issued security advisories due to the widespread use of jackson-databind in enterprise Java applications and frameworks. Mitigation steps require upgrading to jackson-databind version 2.9.10 or 2.8.11.5 and later, which blacklist the vulnerable EhcacheJtaTransactionManagerLookup class to prevent malicious deserialization. Organizations should prioritize identifying all applications using vulnerable jackson-databind versions, implement JSON input validation and filtering, disable polymorphic typing where not required, and maintain updated CVE database records to track similar deserialization vulnerabilities that could compromise Java applications through unsafe object instantiation and type handling mechanisms.