CVE-2026-54513: CWE-184: Incomplete List of Disallowed Inputs in FasterXML jackson-databind
A vulnerability in FasterXML jackson-databind affects versions from 2.10.0 up to but not including 2.18.8, 2.21.4, and 3.1.4. The issue arises because the BasicPolymorphicTypeValidator.Builder.allowIfSubTypeIsArray() method allowlists array types based only on whether the class is an array, without validating the component type against the allowlist. This allows deserialization of arrays of disallowed types, bypassing intended security checks. The vulnerability is fixed in versions 2.18.8, 2.21.4, and 3.1.4.
AI Analysis
Technical Summary
The jackson-databind library's polymorphic type validation mechanism has an incomplete check when allowIfSubTypeIsArray() is used. It allowlists any array type based solely on the array nature of the class, ignoring whether the component element type is allowlisted. Consequently, arrays of disallowed types can be deserialized, bypassing the configured allowlist. This flaw affects versions from 2.10.0 until fixed in 2.18.8, 2.21.4, and 3.1.4. The vulnerability is tracked as CVE-2026-54513 with a CVSS 3.1 score of 8.1 (high severity).
Potential Impact
An attacker can bypass polymorphic type allowlists by exploiting the incomplete validation of array component types, potentially leading to deserialization of malicious types. This can result in full confidentiality, integrity, and availability compromise of affected systems using jackson-databind versions prior to the fixed releases.
Mitigation Recommendations
Upgrade jackson-databind to version 2.18.8, 2.21.4, or 3.1.4 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor advisory indicating these fixed versions. Until upgrade, avoid using allowIfSubTypeIsArray() or restrict deserialization configurations to prevent untrusted data processing.
CVE-2026-54513: CWE-184: Incomplete List of Disallowed Inputs in FasterXML jackson-databind
Description
A vulnerability in FasterXML jackson-databind affects versions from 2.10.0 up to but not including 2.18.8, 2.21.4, and 3.1.4. The issue arises because the BasicPolymorphicTypeValidator.Builder.allowIfSubTypeIsArray() method allowlists array types based only on whether the class is an array, without validating the component type against the allowlist. This allows deserialization of arrays of disallowed types, bypassing intended security checks. The vulnerability is fixed in versions 2.18.8, 2.21.4, and 3.1.4.
CVSS v3.1
Score 8.1high
Affected software
pkg:maven/com.fasterxml.jackson.core/jackson-databindRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The jackson-databind library's polymorphic type validation mechanism has an incomplete check when allowIfSubTypeIsArray() is used. It allowlists any array type based solely on the array nature of the class, ignoring whether the component element type is allowlisted. Consequently, arrays of disallowed types can be deserialized, bypassing the configured allowlist. This flaw affects versions from 2.10.0 until fixed in 2.18.8, 2.21.4, and 3.1.4. The vulnerability is tracked as CVE-2026-54513 with a CVSS 3.1 score of 8.1 (high severity).
Potential Impact
An attacker can bypass polymorphic type allowlists by exploiting the incomplete validation of array component types, potentially leading to deserialization of malicious types. This can result in full confidentiality, integrity, and availability compromise of affected systems using jackson-databind versions prior to the fixed releases.
Mitigation Recommendations
Upgrade jackson-databind to version 2.18.8, 2.21.4, or 3.1.4 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor advisory indicating these fixed versions. Until upgrade, avoid using allowIfSubTypeIsArray() or restrict deserialization configurations to prevent untrusted data processing.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-15T18:01:15.514Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3af602eed863c81e9ec62d
Added to database: 06/23/2026, 21:09:22 UTC
Last enriched: 06/23/2026, 21:24:08 UTC
Last updated: 06/23/2026, 22:25:07 UTC
Views: 6
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