Medium severity · published Jun 23, 2026
CVE-2026-54516
jackson-databind: Renamed @JsonIgnore'd setters can deserialize via private fields
5.3
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JA
jackson-databind · FasterXML
>= 2.21.0, < 2.21.4; >= 3.0.0, < 3.1.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-54516
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-54516
Patch
https://github.com/FasterXML/jackson-databind/commit/c3d56dd25d52319828147c5b9aeabf2d485c250a
Patch
https://github.com/FasterXML/jackson-databind/commit/e88cb17006b6af4883b973058f0bb6486e5074af
Issue Tracking
https://github.com/FasterXML/jackson-databind/pull/5967
Issue Tracking
https://github.com/FasterXML/jackson-databind/pull/5968
Vendor Advisory
https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-9fxm-vc8v-hj55
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