CVE-2026-54515: Fasterxml Jackson-Databind

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. From 2.8.0 until 2.18.9, 2.21.5, and 3.1.4, 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. This vulnerability is fixed in 2.18.9, 2.21.5, and 3.1.4.

Affected products

• Fasterxml Jackson-Databind: from 2.8.0, before 2.18.9 (fixed in 2.18.9); from 2.19.0, before 2.21.5 (fixed in 2.21.5); from 3.0.0, before 3.1.4 (fixed in 3.1.4); version 2.22.0 only

Published 2026-06-23. Last modified 2026-06-29.