jackson-databind's renamed @JsonIgnore'd setters can deserialize via private fields
Summary
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.
Impact
POJOs combining a renamed getter with an ignored setter (a read-only-over-the-wire pattern) have that field silently set from attacker input (property tampering / mass assignment). Not a general gadget; no RCE.
Affected / Patched (verified via git tag --contains)
- 2.21 line:
>= 2.21.0, < 2.21.4-> fixed in 2.21.4 (backportc3d56dd, #5968) - 3.x line:
>= 3.0.0, < 3.1.4-> fixed in 3.1.4 (#5967,e88cb17)
Severity / CWE
Maintainer: minor. Reporter: HIGH. CWE-915.
Credits
Omkhar Arasaratnam (@omkhar) - finder.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Java / Kotlin (Maven) | com.fasterxml.jackson.core:jackson-databind | >= 2.21.0, < 2.21.4, >= 3.0.0, < 3.1.4 | 2.21.4, 3.1.4 |
| Java / Kotlin (Maven) | tools.jackson.core:jackson-databind | >= 3.0.0, < 3.1.4 | 3.1.4 |
Referencias
- https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-9fxm-vc8v-hj55
- https://nvd.nist.gov/vuln/detail/CVE-2026-54516
- https://github.com/FasterXML/jackson-databind/pull/5967
- https://github.com/FasterXML/jackson-databind/pull/5968
- https://github.com/FasterXML/jackson-databind/commit/c3d56dd25d52319828147c5b9aeabf2d485c250a
- https://github.com/FasterXML/jackson-databind/commit/e88cb17006b6af4883b973058f0bb6486e5074af
- https://github.com/FasterXML/jackson-databind
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N- Debilidad (CWE)
CWE-915- Plataforma
- Java / Kotlin (Maven)
- Paquete
com.fasterxml.jackson.core:jackson-databind, tools.jackson.core:jackson-databind- Publicada
- 23.06.2026
- Actualizado
- 11.10.2026 13:20
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-9fxm-vc8v-hj55 - CC BY 4.0
Historial de vulnerabilidades: tools.jackson.core:jackson-databind
Todas las vulnerabilidades publicadas de este paquete (Java / Kotlin (Maven)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 15
- Primera → última
- 06.2026 09.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 5
- Media 10
Divulgaciones por año
- 2026: 15
-
jackson-databind's renamed @JsonIgnore'd setters can deserialize via private fields esta entrada
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