jackson-databind: @JsonView bypassed for @JsonUnwrapped container properties on deserialization

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.5 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS

• CVE-2026-59889: 0.35% estimated exploitation activity in the next 30 days; percentile 28.23 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary UnwrappedPropertyHandler.processUnwrapped() replays the buffered JSON for a @JsonUnwrapped property by iterating its properties and calling prop.deserializeAndSet() with no prop.visibleInView(ctxt.getActiveView()) guard — the exact guard processUnwrappedCreatorProperties() received in the #5971 / GHSA-rcqc-6cw3-h962 fix, and the guard BeanDeserializer.deserializeWithUnwrapped applies to directly-matched properties. As a result, a property annotated with both @JsonView(PrivilegedView.class) and @JsonUnwrapped is written from attacker JSON even when deserializing under a more-restrictive active view. Correction to the original framing (runtime-verified): the gap is NOT a per-field inner @JsonView (the unwrapped sub-object's own BeanDeserializer gates inner fields correctly). The unchecked gate is the view of the unwrapped CONTAINER property. Intent proof (runtime, 2.x HEAD 21dd70dd and 3.x HEAD 7a5939d6) An @JsonView(AdminView) property that is NOT @JsonUnwrapped → null under…

Published by the source

21 Jul 2026, 22:00 UTC

Last modified by the source

19 Oct 2026, 19:31 UTC

Source last checked

26 Oct 2026, 16:58 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-5gvw-p9qm-jgwh

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# Patch Next advisory brief: CVE-2026-59889

Advisory: jackson-databind: @JsonView bypassed for @JsonUnwrapped container properties on deserialization
IDs: CVE-2026-59889, GHSA-5gvw-p9qm-jgwh
Record: https://patchnext.com/advisories/cve-2026-59889 (revision 1, source checked 26 Oct 2026, 16:58 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: tools.jackson.core:jackson-databind 3.2.1, 3.1.5; com.fasterxml.jackson.core:jackson-databind 2.22.1, 2.21.5, 2.18.9. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven tools.jackson.core:jackson-databind: affected >= 3.0.0, <= 3.1.4; >= 3.2.0, < 3.2.1; fixed in 3.2.1, 3.1.5
- Maven com.fasterxml.jackson.core:jackson-databind: affected >= 2.22.0, < 2.22.1; >= 2.19.0, < 2.21.5; >= 2.0.0-RC1, < 2.18.9; fixed in 2.22.1, 2.21.5, 2.18.9

## Suggested inspection (read-only)
- Maven tools.jackson.core:jackson-databind: check the installed version with your package manager.
- Maven com.fasterxml.jackson.core:jackson-databind: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on tools.jackson.core:jackson-databind, com.fasterxml.jackson.core:jackson-databind.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-5gvw-p9qm-jgwh (GitHub-reviewed advisory GHSA-5gvw-p9qm-jgwh lists affected ranges: Maven tools.jackson.core:jackson-databind >=3.0.0 =3.2.0 =2.22.0 =2.19.0 =2.0.0-RC1 <2.18.9)

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