CVE-2026-54513 Security Details

CVE ID

CVE-2026-54513

CWE

CWE-184

CVE Description

jackson-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.

Published

Jun 16, 2026

CVSS Score & Severity

9.3Critical

CVSS Vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS Score

1.226%

Malware

malware

KEV Status

Not in KEV Catalog: No known exploits

Vulnerable Methods

com/fasterxml/jackson/databind/jsontype/BasicPolymorphicTypeValidator$Builder.allowIfSubTypeIsArray()Lcom/fasterxml/jackson/databind/jsontype/BasicPolymorphicTypeValidator$Builder;

JVM

tools/jackson/databind/jsontype/BasicPolymorphicTypeValidator$Builder.allowIfSubTypeIsArray()Ltools/jackson/databind/jsontype/BasicPolymorphicTypeValidator$Builder;

JVM

Affected Ecosystems

affected

Source

National Vulnerability Database

References

fedoraproject.orgPROJECT

GitHub · FasterXML/jackson-databindPROJECT