jackson-databind: Array subtype allowlist bypass in BasicPolymorphicTypeValidator (allowIfSubTypeIsArray)

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Summary

CVECVE-2026-54513
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-23 21:17:02 UTC
Updated2026-06-23 21:17:02 UTC
Descriptionjackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. From 2.10.0 until 2.18.8, 2.21.4, and 3.1.4, BasicPolymorphicTypeValidator.Builder.allowIfSubTypeIsArray() allowlists any array type based only on clazz.isArray(), without validating the array's component (element) type against the configured allowlist. A PTV built with allowIfSubTypeIsArray() plus an explicit concrete-type allowlist therefore still permits EvilType[] even though EvilType is not allowlisted. When Jackson deserializes the elements and no per-element type IDs are present, it instantiates the component type directly with no further PTV check, bypassing the allowlist. This vulnerability is fixed in 2.18.8, 2.21.4, and 3.1.4.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-184 | CWE-184 CWE-184: Incomplete List of Disallowed Inputs

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA FasterXML Jackson-databind affected >= 2.10.0, < 2.18.8 Not specified
CNA FasterXML Jackson-databind affected >= 2.19.0, < 2.21.4 Not specified
CNA FasterXML Jackson-databind affected >= 3.0.0, < 3.1.4 Not specified

References

ReferenceSourceLinkTags
github.com/FasterXML/jackson-databind/commit/24529da29fdf46ff94ca38de9eb... [email protected] github.com
github.com/FasterXML/jackson-databind/security/advisories/GHSA-rmj7-2vxq... [email protected] github.com
github.com/FasterXML/jackson-databind/issues/5983 [email protected] github.com
github.com/FasterXML/jackson-databind/commit/01d1692c8d0ed03e51a0e3c4f8a... [email protected] github.com
github.com/FasterXML/jackson-databind/issues/5981 [email protected] github.com
github.com/FasterXML/jackson-databind/pull/5984 [email protected] github.com
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