CVE-2026-54515: jackson-databind has case-insensitive deserialization bypasses per-property @JsonIgnoreProperties
(updated )
In BeanDeserializerBase.createContextual(), per-property @JsonIgnoreProperties exclusions are applied by _handleByNameInclusion(), producing a contextual deserializer whose BeanPropertyMap has the ignored properties removed. The subsequent per-property case-insensitivity block (triggered by @JsonFormat(ACCEPT_CASE_INSENSITIVE_PROPERTIES)) rebuilds from this._beanProperties (the original, unfiltered map) instead of contextual._beanProperties, then overwrites the filtered map — restoring every property _handleByNameInclusion had just removed. The ignored property becomes writable again.
References
- github.com/FasterXML/jackson-databind/commit/0e1b0b211f7a53baa62ba2f4c9bd006c7bf4d5fa
- github.com/FasterXML/jackson-databind/issues/5962
- github.com/FasterXML/jackson-databind/issues/5964
- github.com/FasterXML/jackson-databind/security/advisories/GHSA-5jmj-h7xm-6q6v
- github.com/advisories/GHSA-5jmj-h7xm-6q6v
- nvd.nist.gov/vuln/detail/CVE-2026-54515
Code Behaviors & Features
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