CVE-2026-54515
Received Received - Intake
Deserialization Flaw in Jackson-Databind

Publication date: 2026-06-23

Last updated on: 2026-06-23

Assigner: GitHub, Inc.

Description
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.
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Meta Information
Published
2026-06-23
Last Modified
2026-06-23
Generated
2026-06-24
AI Q&A
2026-06-24
EPSS Evaluated
N/A
NVD
CVE-2026-54515
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
jackson jackson-databind From 2.8.0 (inc) to 2.18.9 (exc)
jackson jackson-databind 2.21.5
jackson jackson-databind 3.1.4
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-915 The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.
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Executive Summary

This vulnerability exists in the jackson-databind library versions from 2.8.0 up to 2.18.9, 2.21.5, and 3.1.4. It occurs in the BeanDeserializerBase.createContextual() method where per-property @JsonIgnoreProperties exclusions are applied to remove ignored properties from the BeanPropertyMap. However, a subsequent case-insensitivity processing step incorrectly rebuilds the property map from the original unfiltered properties instead of the filtered ones, effectively restoring the ignored properties and making them writable again.

This means that properties that were supposed to be ignored during deserialization can be manipulated, potentially allowing unintended data binding behavior.

Impact Analysis

The vulnerability can lead to unintended writable access to properties that were meant to be ignored during data deserialization. This can result in improper handling of data, potentially allowing attackers to inject or modify data fields that should have been excluded.

Such behavior can cause integrity issues in applications relying on jackson-databind for JSON processing, possibly leading to security risks such as data corruption or unauthorized data manipulation.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade jackson-databind to one of the fixed versions: 2.18.9, 2.21.5, or 3.1.4.

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