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jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. From 2.10.0 until 2.18.8, 2.21.4, and 3.1.4, jackson-databind's PolymorphicTypeValidator (PTV) is the primary safety mechanism guarding polymorphic deserialization. When polymorphic typing is enabled and a type identifier contains generic parameters (i.e. the type ID string contains <), DatabindContext._resolveAndValidateGeneric() validates only the raw container class name (the substring before <) against the configured PTV. If the container type is approved, the method parses the full canonical type string via TypeFactory.constructFromCanonical() and returns the fully parameterized type without ever validating the nested type arguments against the PTV. The nested type arguments are then resolved, instantiated, and populated as beans during deserialization. An attacker who controls the type ID can therefore place a denied class as a generic type parameter of an allowed container — for example java.util.ArrayList<com.evil.Gadget> when only java.util.ArrayList is allow-listed. The container passes the PTV check; com.evil.Gadget is loaded via Class.forName(name, true, loader), instantiated, and its properties are set from attacker-controlled JSON. This completely bypasses an explicitly configured PTV allow-list. This vulnerability is fixed in 2.18.8, 2.21.4, and 3.1.4.
Edited
This issue has been addressed in the following products: Red Hat Build of Apache Camel 4.18 for Quarkus 3.33 Via RHSA-2026:36839 https://access.redhat.com/errata/RHSA-2026:36839
updated
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:40895 https://access.redhat.com/errata/RHSA-2026:40895
This issue has been addressed in the following products: Red Hat Data Grid 8.6.2 Via RHSA-2026:41951 https://access.redhat.com/errata/RHSA-2026:41951
This issue has been addressed in the following products: Red Hat Enterprise Linux 10 Via RHSA-2026:43400 https://access.redhat.com/errata/RHSA-2026:43400
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Via RHSA-2026:44062 https://access.redhat.com/errata/RHSA-2026:44062
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Via RHSA-2026:44063 https://access.redhat.com/errata/RHSA-2026:44063
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Via RHSA-2026:44061 https://access.redhat.com/errata/RHSA-2026:44061
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Via RHSA-2026:44065 https://access.redhat.com/errata/RHSA-2026:44065
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat Enterprise Linux 8.8 Telecommunications Update Service Via RHSA-2026:44066 https://access.redhat.com/errata/RHSA-2026:44066
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:44064 https://access.redhat.com/errata/RHSA-2026:44064
This issue has been addressed in the following products: Red Hat Enterprise Linux 10.0 Extended Update Support Via RHSA-2026:44271 https://access.redhat.com/errata/RHSA-2026:44271
This issue has been addressed in the following products: Cryostat 4 on RHEL 9 Via RHSA-2026:48151 https://access.redhat.com/errata/RHSA-2026:48151