CVE-2026-54518: jackson-databind: @JsonView bypass for unwrapped creator parameters in jackson-databind

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-23 · updated 2026-10-25
Weakness: CWE-863

Description

jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. From 2.21.0 until 2.21.4 and 3.1.4, UnwrappedPropertyHandler.processUnwrappedCreatorProperties() replays buffered JSON into creator parameters but never consults prop.visibleInView(activeView). The normal property-based creator path gates creator properties on the active view, but this unwrapped-creator replay path bypasses that check, so a constructor parameter annotated with both @JsonView(AdminView.class) and @JsonUnwrapped is populated from attacker JSON even when a more restrictive view is active. This vulnerability is fixed in 2.21.4 and 3.1.4.

Affected products

FasterXML jackson-databind: from 2.21.0 before 2.21.4; from 3.0.0 before 3.1.4 — fixed in 2.21.4, 3.1.4

How to fix

Upgrade to a fixed version: FasterXML jackson-databind 2.21.4, 3.1.4. Check the vendor advisory for mitigations.

References

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