CVE-2026-54516 Fasterxml — Exploit & Vulnerability Details MEDIUM

Parameter	Value
CVSS	5.3 (MEDIUM)
Affected Versions	2.21.0 — 3.1.4
Fixed In	3.1.4
Type	CWE-915
Vendor	Fasterxml
Public PoC	No

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.

Attack Parameters

Attack Vector

Network

Can be exploited remotely

Attack Complexity

Low

Easy to exploit

Privileges Required

None

No privileges needed

User Interaction

None

No user interaction needed

Impact Assessment

Confidentiality

None

No data leak

Integrity

Low

Partial data modification

Availability

None

No disruption

CVSS Vector v3.1

Weakness Type (CWE)

CWE-915

Vulnerable Products 2

Configuration	From (including)	Up to (excluding)
Fasterxml Jackson-Databind cpe:2.3:a:fasterxml:jackson-databind::::::::	`2.21.0`	`2.21.4`
Fasterxml Jackson-Databind cpe:2.3:a:fasterxml:jackson-databind::::::::	`3.0.0`	`3.1.4`