Vulnerability · Published Jun 23, 2026 · Assigned by GitHub_M
CVE-2026-54516jackson-databind: Renamed @JsonIgnore'd setters can deserialize via private fields
Medium 5.3
In plain English
A medium-severity security flaw in jackson-databind from FasterXML. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | jackson-databind | no fix listed | DEBIAN-CVE-2026-54516 |
| Debian:14 | jackson-databind | no fix listed | DEBIAN-CVE-2026-54516 |
| Maven | com.fasterxml.jackson.core:jackson-databind | 2.21.4 | GHSA-9fxm-vc8v-hj55 |
| Maven | com.fasterxml.jackson.core:jackson-databind | 3.1.4 | GHSA-9fxm-vc8v-hj55 |
| Maven | tools.jackson.core:jackson-databind | 3.1.4 | GHSA-9fxm-vc8v-hj55 |
| Ubuntu:22.04:LTS | jackson-databind | no fix listed | UBUNTU-CVE-2026-54516 |
| Ubuntu:24.04:LTS | jackson-databind | no fix listed | UBUNTU-CVE-2026-54516 |
| Ubuntu:25.10 | jackson-databind | no fix listed | UBUNTU-CVE-2026-54516 |
| Ubuntu:26.04:LTS | jackson-databind | no fix listed | UBUNTU-CVE-2026-54516 |
| Ubuntu:26.10 | jackson-databind | no fix listed | UBUNTU-CVE-2026-54516 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| FasterXML | jackson-databind | >= 2.21.0, < 2.21.4>= 3.0.0, < 3.1.4 |
Weakness: CWE-915 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
References
- https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-9fxm-vc8v-hj55 x_refsource_CONFIRM
- https://github.com/FasterXML/jackson-databind/pull/5967 x_refsource_MISC
- https://github.com/FasterXML/jackson-databind/pull/5968 x_refsource_MISC
- https://github.com/FasterXML/jackson-databind/commit/c3d56dd25d52319828147c5b9aeabf2d485c250a x_refsource_MISC
- https://github.com/FasterXML/jackson-databind/commit/e88cb17006b6af4883b973058f0bb6486e5074af x_refsource_MISC