GHSA-5jmj-h7xm-6q6v

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GHSA-5jmj-h7xm-6q6v

Summary: jackson-databind has case-insensitive deserialization bypasses per-property @JsonIgnoreProperties

Details: ## 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.

References: https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-5jmj-h7xm-6q6v, https://nvd.nist.gov/vuln/detail/CVE-2026-54515, https://github.com/FasterXML/jackson-databind/issues/5962, https://github.com/FasterXML/jackson-databind/issues/5964, https://github.com/FasterXML/jackson-databind/commit/0e1b0b211f7a53baa62ba2f4c9bd006c7bf4d5fa, https://github.com/FasterXML/jackson-databind