CVE-2026-59285: Jackson Polymorphic Type Validator Allow Map Basetype

Allowing 'Map' or 'Collection' as a base type in Jackson's PolymorphicTypeValidator permits deserialization of arbitrary Map/Collection implementations and gadget chains. Use 'allowIfSubType' with specific safe classes (e.g., HashMap, LinkedHashMap) instead.

Provally CuratedPublic repositoryMediumHigh confidenceVerifiedApache-2.0

Java

greprules fetch cve-2026-59285-jackson-polymorphic-type-validator-allow-map-basetype --engine opengrep

Description

License: Apache-2.0
Source context: Public repository
Source: Provally CVE rule catalog
Validation status: Verified
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