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CVE-2026-54513— jackson-databind: Array subtype allowlist bypass in BasicPolymorphicTypeValidator (allowIfSubTypeIsArray)

Quick assessment

Affected
FasterXML jackson-databind
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FasterXML jackson-databind是FasterXML组织开源的其中的一个具有数据绑定功能的组件。 FasterXML jackson-databind存在输入验证错误漏洞，该漏洞源于BasicPolymorphicTypeValidator.Builder.allowIfSubTypeIsArray()方法仅基于clazz.isArray()对数组类型进行白名单验证，而未验证数组组件（元素）类型，导致即使EvilType未在白名单中也可被绕过，当Jackson反序列化元素且无元素类型I

CVSS 8.1 · High EPSS 1.23% · P68

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
FasterXML jackson-databind >= 2.10.0, < 2.18.8 affected
>= 2.19.0, < 2.21.4 affected
>= 3.0.0, < 3.1.4 affected
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I. Basic Information for CVE-2026-54513

Vulnerability Information
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Vulnerability Title
jackson-databind: Array subtype allowlist bypass in BasicPolymorphicTypeValidator (allowIfSubTypeIsArray)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的黑名单
Source: CVE Program / CVE List V5
Vulnerability Title
FasterXML jackson-databind 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FasterXML jackson-databind是FasterXML组织开源的其中的一个具有数据绑定功能的组件。 FasterXML jackson-databind存在输入验证错误漏洞，该漏洞源于BasicPolymorphicTypeValidator.Builder.allowIfSubTypeIsArray()方法仅基于clazz.isArray()对数组类型进行白名单验证，而未验证数组组件（元素）类型，导致即使EvilType未在白名单中也可被绕过，当Jackson反序列化元素且无元素类型I
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FasterXML jackson-databind >= 2.10.0, < 2.18.8 -

II. Public POCs for CVE-2026-54513

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 12594 chars
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III. Intelligence Information for CVE-2026-54513

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Patches & Fixes for CVE-2026-54513 (4)

Vendor Advisories for CVE-2026-54513 (2)

Same Patch Batch · FasterXML · 2026-06-23 · 8 CVEs total

CVE-2026-54512 8.1 HIGH jackson-databind: PolymorphicTypeValidator bypass via generic type parameters allows arbit
CVE-2026-54518 6.5 MEDIUM jackson-databind: @JsonView bypass for unwrapped creator parameters in jackson-databind
CVE-2026-54516 5.3 MEDIUM jackson-databind: Renamed @JsonIgnore'd setters can deserialize via private fields
CVE-2026-54515 5.3 MEDIUM jackson-databind: Case-insensitive deserialization bypasses per-property @JsonIgnoreProper
CVE-2026-54514 5.3 MEDIUM jackson-databind: InetSocketAddress deserialization triggers eager DNS resolution (SSRF)
CVE-2026-54517 5.3 MEDIUM jackson-databind: @JsonView bypass for setterless creator properties
CVE-2026-50193 jackson-databind: Deeply nested JsonNode throws StackOverflowError for toString()

IV. Related Vulnerabilities

Same product: jackson-databind
Same vendor: FasterXML
Same weakness: CWE-184

V. Comments for CVE-2026-54513

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