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Medium severityNVD Advisory· Published Jun 23, 2026

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

CVE-2026-54515

Description

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 Fixed in 2.18.9, 2.21.5 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.

Credits

Omkhar Arasaratnam (@omkhar) - finder.

AI Insight

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
com.fasterxml.jackson.core:jackson-databindMaven
>= 3.1.0, < 3.1.43.1.4
tools.jackson.core:jackson-databindMaven
>= 3.1.0, < 3.1.43.1.4
com.fasterxml.jackson.core:jackson-databindMaven
>= 2.8.0, < 2.18.92.18.9
com.fasterxml.jackson.core:jackson-databindMaven
>= 2.19.0, < 2.21.52.21.5

Affected products

3

Patches

Vulnerability mechanics

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References

5

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