Vulnerability in Fasterxml Jackson-Databind
CVE-2026-54515
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.
Vulnerability class: Mass Assignment
EPSS: 0.004 (31.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Fasterxml Jackson-databind — versions >= 2.19.0, < 2.21.5, >= 3.1.0, < 3.1.4, >= 2.8.0, < 2.18.9
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-54515?
- CVE-2026-54515 is a medium-severity vulnerability in Fasterxml Jackson-Databind, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 5.3/10. Published 2026-06-23.
- How severe is CVE-2026-54515?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2026-54515 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.