medium

CVE-2026-54515

Maven · com.fasterxml.jackson.core:jackson-databind

Summary

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

Severity
medium
CVSS
5.3
EPSS
0.3% (p28)
CWE
CWE-915
Also known as
GHSA-5jmj-h7xm-6q6v#com.fasterxml.jackson.core:jackson-databind
Published
2026-06-23
Updated
2026-06-23

Advisory 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

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.

References

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.