Is This vulnerability exploited in the wild?

No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

How severe is This vulnerability?

Medium severity, with a CVSS score of 6.5, published 21 July 2026.

Which products and versions are affected?

FasterXML Jackson Databind >= 2.18.0, <= 2.18.8.

Is there a fix for This vulnerability?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is This vulnerability attacked?

It is attacked over the network, in a software library.

Check whether you run FasterXML Jackson Databind at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

FasterXML jackson-databind JsonView bypass in creator properties

Q: Is there a fix for This vulnerability?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

Q: How is This vulnerability attacked?

It is attacked over the network, in a software library.

Q: Am I affected?

Check whether you run FasterXML Jackson Databind at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Severity: medium · CVSS 6.5 · Published 2026-07-21

A security bypass exists in the Jackson data processing library, which is widely used in Java applications to handle data exchange. Under specific configurations, an attacker can submit data to fields that are supposed to be restricted or hidden, such as administrative settings or internal metadata. This could allow unauthorized users to modify sensitive data or bypass access controls in web applications that rely on Jackson for data validation.

Technologies: FasterXML Jackson Databind. Vendors: FasterXML.

Quick answers

Is This vulnerability exploited in the wild?: No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?: Medium severity, with a CVSS score of 6.5, published 21 July 2026.
Which products and versions are affected?: FasterXML Jackson Databind >= 2.18.0, <= 2.18.8.
Is there a fix for This vulnerability?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is This vulnerability attacked?: It is attacked over the network, in a software library.
Am I affected?: Check whether you run FasterXML Jackson Databind at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An authorization bypass (CWE-863) exists in BeanDeserializer.java within the deserializeUsingPropertyBasedWithExternalTypeId method. The vulnerability occurs because the creator-property branch fails to perform a visibility check using visibleInView(activeView), unlike the regular bean-property branch. An attacker can exploit this by providing JSON input that targets a constructor parameter annotated with both @JsonView and @JsonTypeInfo(include=As.EXTERNAL_PROPERTY). This allows the population of restricted fields even when a more restrictive view is active. The issue is a patch gap where a fix in the 3.x line was not backported to the 2.18 and 2.21 branches. Patches are available in versions 2.18.9 and 2.21.5.

Affected products

FasterXML jackson-databind >= 2.18.0, <= 2.18.8
FasterXML jackson-databind >= 2.21.0, <= 2.21.4

Timeline

2026-05-22: other: Fix committed to 3.x branch
2026-07-10: disclosed: Advisory published by maintainer
2026-07-21: advisory: GitHub Advisory Database entry reviewed

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.