CVE-2026-54515: FasterXML jackson-databind property exclusion bypass in BeanDeserializerBase

CVE-2026-54515 · Severity: medium · CVSS 5.3 · Published 2026-06-23

Jackson-databind is a widely used Java library for converting data between JSON and Java objects. A flaw in how it handles specific configuration settings allows attackers to modify data fields that were intended to be protected or ignored. This could lead to unauthorized data changes, similar to a 'mass assignment' attack, where an attacker updates sensitive internal object properties that should not be accessible via public APIs.

Technologies: FasterXML Jackson Databind, com.fasterxml.jackson.core:jackson-databind (Maven), tools.jackson.core:jackson-databind (Maven). Vendors: FasterXML, Maven.

Quick answers

Is CVE-2026-54515 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-54515 being exploited in the wild.
How severe is CVE-2026-54515?
Medium severity, with a CVSS score of 5.3, published 23 June 2026.
Which products and versions are affected?
FasterXML Jackson Databind >= 2.8.0, < 2.18.9; >= 2.19.0, < 2.21.5; >= 3.1.0, < 3.1.4; com.fasterxml.jackson.core:jackson-databind (Maven) ECOSYSTEM:introduced=3.1.0,fixed=3.1.4; tools.jackson.core:jackson-databind (Maven) ECOSYSTEM:introduced=3.1.0,fixed=3.1.4.
Is there a fix for CVE-2026-54515?
Yes. com.fasterxml.jackson.core:jackson-databind (Maven): upgrade to 3.1.4 or later; tools.jackson.core:jackson-databind (Maven): upgrade to 3.1.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-54515 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-54515?
Check whether you run FasterXML Jackson Databind, com.fasterxml.jackson.core:jackson-databind (Maven) or tools.jackson.core:jackson-databind (Maven) 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.

How to fix

  • com.fasterxml.jackson.core:jackson-databind (Maven): upgrade to 3.1.4 or later
    # set com.fasterxml.jackson.core:jackson-databind to 3.1.4 in your pom.xml or build.gradle
  • tools.jackson.core:jackson-databind (Maven): upgrade to 3.1.4 or later
    # set tools.jackson.core:jackson-databind to 3.1.4 in your pom.xml or build.gradle

Technical details

A vulnerability exists in BeanDeserializerBase.createContextual() where per-property @JsonIgnoreProperties exclusions are bypassed. When @JsonFormat(ACCEPT_CASE_INSENSITIVE_PROPERTIES) is used, the deserializer rebuilds its property map from the original unfiltered map (this._beanProperties) instead of the filtered contextual map. This action overwrites the exclusions applied by _handleByNameInclusion(), making ignored properties writable again. An attacker can exploit this via a network request to perform a mass-assignment attack against affected Java objects. The issue is fixed in versions 2.18.9, 2.21.5, and 3.1.4.

Affected products

  • FasterXML jackson-databind >= 2.8.0, < 2.18.9; >= 2.19.0, < 2.21.5; >= 3.1.0, < 3.1.4

Identifiers

  • CVE-2026-54515
  • GHSA-5jmj-h7xm-6q6v

Timeline

  • 2026-05-06: disclosed: Issue reported and fix developed in GitHub repository
  • 2026-06-04: patched: Official release of fixed versions
  • 2026-06-16: advisory: GitHub Security Advisory published
  • 2026-06-23: advisory: NVD publication date

References

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