Vulnerability in Fasterxml Jackson-Databind
CVE-2026-54516
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 class: Mass Assignment
EPSS: 0.004 (38.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Fasterxml Jackson-databind — versions >= 2.21.0, < 2.21.4, >= 3.0.0, < 3.1.4
Weakness classification (CWE)
References
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-54516?
- CVE-2026-54516 is a medium-severity vulnerability in Fasterxml Jackson-Databind, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 5.3/10. Published 2026-06-23.
- How severe is CVE-2026-54516?
- Medium severity. CVSS v3 base score is 5.3 out of 10.