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CVE-2026-83557— jackson-databind omits java.lang.Comparable from DefaultBaseTypeLimitingValidator's unsafe base types

Quick assessment

Affected
FasterXML jackson-databind
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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组织开源的一个具有数据绑定功能的组件。 FasterXML jackson-databind 2.11.0版本至2.18.10之前版本、2.19.0版本至2.21.6之前版本、2.22.0版本至2.22.2之前版本、3.0.0版本至3.1.6之前版本和3.2.0版本至3.2.2之前版本存在安全漏洞，该漏洞源于DefaultBaseTypeLimitingValidator未将java.lang.Comparable列入不安全基础类型列

CVSS 5.6 · Medium EPSS 0.59% · P46

Affected Version Matrix 5

VendorProduct Version RangeStatus
FasterXML jackson-databind 2.11.0< 2.18.10 affected
2.19.0< 2.21.6 affected
2.22.0< 2.22.2 affected
3.0.0< 3.1.6 affected
3.2.0< 3.2.2 affected
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I. Basic Information for CVE-2026-83557

Vulnerability Information
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Vulnerability Title
jackson-databind omits java.lang.Comparable from DefaultBaseTypeLimitingValidator's unsafe base types
Source: CVE Program / CVE List V5
Vulnerability Description
DefaultBaseTypeLimitingValidator is the PolymorphicTypeValidator applied automatically whenever @JsonTypeInfo is used without an explicitly configured custom validator. It denies polymorphic resolution only for a fixed set of "unsafe base types", and its isSafeSubType method returns true unconditionally for every base type outside that set. java.lang.Comparable was absent from the list despite being implemented by a very large fraction of JDK and application classes, comparable in breadth to java.io.Serializable, which is on the list for that reason. An application declaring an @JsonTypeInfo-annotated property or class with Comparable as its base type, and no custom PolymorphicTypeValidator, will accept a type identifier for essentially any class implementing Comparable. This yields an attacker-controlled object instantiation primitive; a demonstrated case constructs a java.io.File for an arbitrary attacker-chosen path, which becomes path-traversal-adjacent if the application subsequently calls path-sensitive methods on the value. No class implementing Comparable has been identified that yields code execution through deserialization alone. Global Default Typing via activateDefaultTyping is not affected, because that method structurally requires an explicit PolymorphicTypeValidator argument. This affects com.fasterxml.jackson.core:jackson-databind from 2.11.0 before 2.18.10, from 2.19.0 before 2.21.6, and from 2.22.0 before 2.22.2, and tools.jackson.core:jackson-databind from 3.0.0 before 3.1.6 and from 3.2.0 before 3.2.2. Users should upgrade to 2.18.10, 2.21.6, 2.22.2, 3.1.6, or 3.2.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
FasterXML jackson-databind 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FasterXML jackson-databind是FasterXML组织开源的一个具有数据绑定功能的组件。 FasterXML jackson-databind 2.11.0版本至2.18.10之前版本、2.19.0版本至2.21.6之前版本、2.22.0版本至2.22.2之前版本、3.0.0版本至3.1.6之前版本和3.2.0版本至3.2.2之前版本存在安全漏洞，该漏洞源于DefaultBaseTypeLimitingValidator未将java.lang.Comparable列入不安全基础类型列
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 2.11.0 ~ 2.18.10 -
FasterXML jackson-databind 3.0.0 ~ 3.1.6 -

II. Public POCs for CVE-2026-83557

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III. Intelligence Information for CVE-2026-83557

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Patches & Fixes for CVE-2026-83557 (2)

Vendor Advisories for CVE-2026-83557 (1)

Proof of Concept for CVE-2026-83557 (1)

IV. Related Vulnerabilities

Same product: jackson-databind
Same vendor: FasterXML
Same weakness: CWE-502

V. Comments for CVE-2026-83557

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