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.
Severity (CVSS)
| Base score | 8.1 |
|---|---|
| Severity | High |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Provided by | CNA |
Weaknesses
- CWE-184 — CWE-184: Incomplete List of Disallowed Inputs
Affected products
| Vendor | Product | Versions |
|---|---|---|
| FasterXML | jackson-databind | >= 2.10.0, < 2.18.8; >= 2.19.0, < 2.21.4; >= 3.0.0, < 3.1.4 |
References
- https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-rmj7-2vxq-3g9f (x_refsource_CONFIRM)
- https://github.com/FasterXML/jackson-databind/issues/5981 (x_refsource_MISC)
- https://github.com/FasterXML/jackson-databind/issues/5983 (x_refsource_MISC)
- https://github.com/FasterXML/jackson-databind/pull/5984 (x_refsource_MISC)
- https://github.com/FasterXML/jackson-databind/commit/01d1692c8d0ed03e51a0e3c4f8a9e6908e4931e5 (x_refsource_MISC)
- https://github.com/FasterXML/jackson-databind/commit/24529da29fdf46ff94ca38de9ebf31cd188f5e8e (x_refsource_MISC)
Generated from the official CVE List on 24 Jun 2026 09:35 UTC.