JacksonDatabind <3.1.4 POJOPropertiesCollector Bypass @JsonIgnore Advisory
CVE-2026-54516 Published on June 23, 2026
jackson-databind: Renamed @JsonIgnore'd setters can deserialize via private fields
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.
Vulnerability Analysis
CVE-2026-54516 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is a Mass Assignment Vulnerability?
The software receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.
CVE-2026-54516 has been classified to as a Mass Assignment vulnerability or weakness.
Products Associated with CVE-2026-54516
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Affected Versions
FasterXML jackson-databind:- Version >= 2.21.0, < 2.21.4 is affected.
- Version >= 3.0.0, < 3.1.4 is affected.