GHSA-5jmj-h7xm-6q6v: jackson-databind has case-insensitive deserialization bypasses per-property @JsonIgnoreProperties

Summary 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. Impact An application that both enables case-insensitive matching and relies on per-property @JsonIgnoreProperties to keep a field unwritable can have that field set from untrusted JSON (mass-assignment-style write). Affected / Patched Will be fixed in 2.18.9, 2.21.5, 2.22.1 and 3.1.4. Severity / CWE Maintainer: minor. Reporter: Moderate. CWE-915. Upstream fix FasterXML/jackson-databind#5962 (PR #5964, 0e1b0b2), milestone 3.1.4. Released 2026-06-04.