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jackson-databind has @JsonView bypass for setterless creator properties

Moderate severity GitHub Reviewed Published Jun 16, 2026 in FasterXML/jackson-databind • Updated Jul 20, 2026

Package

maven com.fasterxml.jackson.core:jackson-databind (Maven)

Affected versions

>= 2.21.0, < 2.21.4
>= 3.0.0, < 3.1.4

Patched versions

2.21.4
3.1.4
maven tools.jackson.core:jackson-databind (Maven)
>= 3.0.0, < 3.1.4
3.1.4

Description

Summary

In BeanDeserializer._deserializeUsingPropertyBased, the active-view (@JsonView) filter was applied only to creator properties; the regular property-buffering branch performed no prop.visibleInView(activeView) check. A change making SetterlessProperty.isMerging() return true routed setterless Collection/Map properties through this unguarded path, so a setterless collection annotated with a restricted @JsonView is populated from attacker JSON even when the active view excludes it.

Impact

View-restricted (e.g. admin-only) setterless collection/map properties can be written from untrusted JSON despite @JsonView gating — an access-control / mass-assignment bypass. No RCE or DoS.

Affected / Patched (verified via git tag --contains)

  • 2.21 line: >= 2.21.0, < 2.21.4 -> fixed in 2.21.4 (backport 94c5d21, #5970)
  • 3.x line: >= 3.0.0, < 3.1.4 -> fixed in 3.1.4 (#5969, 5bf23ed)

Severity / CWE

Maintainer: minor. Reporter: HIGH. CWE-863 (Incorrect Authorization); related CWE-1220.

Credits

Omkhar Arasaratnam (@omkhar) - finder.

References

@cowtowncoder cowtowncoder published to FasterXML/jackson-databind Jun 16, 2026
Published by the National Vulnerability Database Jun 23, 2026
Published to the GitHub Advisory Database Jun 23, 2026
Reviewed Jun 23, 2026
Last updated Jul 20, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(31st percentile)

Weaknesses

Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. Learn more on MITRE.

CVE ID

CVE-2026-54517

GHSA ID

GHSA-5hh8-q8hv-fr38

Source code

Credits

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