CVE-2026-54516: Fasterxml Jackson-Databind

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. From 2.21.0 until 2.21.4 and 3.1.4, POJOPropertiesCollector._renameProperties() allows a property with @JsonProperty("renamed") on the getter and @JsonIgnore on the setter to be renamed rather than dropped. With MapperFeature.INFER_PROPERTY_MUTATORS enabled (default), the private backing field is retained; during deserialization BeanDeserializerFactory.addBeanProps() sees hasField()==true, builds a FieldProperty, and makes the backing field writable. An attacker supplying the renamed JSON key writes the backing field directly, bypassing the @JsonIgnore on the setter. This vulnerability is fixed in 3.1.4.

Affected products

• Fasterxml Jackson-Databind: from 2.21.0, before 2.21.4 (fixed in 2.21.4); from 3.0.0, before 3.1.4 (fixed in 3.1.4)

Published 2026-06-23. Last modified 2026-06-27.