Jackson-databind CVE-2026-59889 PrivEsc via @JsonUnwrapped @JsonView 2.18.x-3.2.x
CVE-2026-59889 Published on July 14, 2026
jackson-databind: @JsonView ypassed for @JsonUnwrapped container properties on deserialization
jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. From 2.18.0 until 2.18.9, 2.21.5, 2.22.1, 3.1.5, and 3.2.1, UnwrappedPropertyHandler.processUnwrapped() replays buffered JSON for a @JsonUnwrapped property and calls prop.deserializeAndSet() without a prop.visibleInView(ctxt.getActiveView()) guard, allowing a property annotated with both @JsonView and @JsonUnwrapped to be written from attacker JSON under a less-privileged active view. This issue is fixed in versions 2.18.9, 2.21.5, 2.22.1, 3.1.5, and 3.2.1.
Vulnerability Analysis
CVE-2026-59889 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-59889 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-59889
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Affected Versions
FasterXML jackson-databind:- Version >= 2.18.0, < 2.18.9 is affected.
- Version >= 2.21.0, < 2.21.5 is affected.
- Version >= 2.22.0, < 2.22.1 is affected.
- Version >= 3.0.0, < 3.1.5 is affected.
- Version >= 3.2.0, < 3.2.1 is affected.