FasterXML jackson-databind up to 3.2.0 UnwrappedPropertyHandler UnwrappedPropertyHandler.processUnwrapped view deserialization

Summaryinfo

A vulnerability has been found in FasterXML jackson-databind up to 2.18.8/2.21.4/2.22.0/3.1.4/3.2.0 and classified as critical. The affected element is the function UnwrappedPropertyHandler.processUnwrapped of the component UnwrappedPropertyHandler. This manipulation of the argument view causes deserialization. This vulnerability is registered as CVE-2026-59889. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in FasterXML jackson-databind up to 2.18.8/2.21.4/2.22.0/3.1.4/3.2.0 and classified as critical. Affected by this vulnerability is the function UnwrappedPropertyHandler.processUnwrapped of the component UnwrappedPropertyHandler. The manipulation of the argument view with an unknown input leads to a deserialization vulnerability. The CWE definition for the vulnerability is CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-59889 since 07/07/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

Upgrading to version 2.18.9, 2.21.5, 2.22.1, 3.1.5 or 3.2.1 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• FasterXML

Name

• jackson-databind

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.18.0
• 2.18.1
• 2.18.2
• 2.18.3
• 2.18.4
• 2.18.5
• 2.18.6
• 2.18.7
• 2.18.8
• 2.19
• 2.20
• 2.21
• 2.21.0
• 2.21.1
• 2.21.2
• 2.21.3
• 2.21.4
• 2.22.0
• 3.0
• 3.1
• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.2.0

License

• open-source

Website

• Product: https://github.com/FasterXML/jackson-databind/

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CPE 2.2info

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