CVE-2026-54513
jackson-databind: Array subtype allowlist bypass in BasicPolymorphicTypeValidator (allowIfSubTypeIsArray)
- State
- Published
- Severity
- 8.1 High
- Published
- Jun 23, 2026
- Updated
- Sep 14, 2026
- Reserved
- Jun 15, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | GitHub_M |
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | redhat-SADP |
Weaknesses
- CWE-184 Incomplete List of Disallowed Inputs
Affected Products
| Product | Versions |
|---|---|
jackson-databindFasterXML |
|
References
- https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-rmj7-2vxq-3g9f
- https://github.com/FasterXML/jackson-databind/issues/5981
- https://github.com/FasterXML/jackson-databind/issues/5983
- https://github.com/FasterXML/jackson-databind/pull/5984
- https://github.com/FasterXML/jackson-databind/commit/01d1692c8d0ed03e51a0e3c4f8a9e6908e4931e5
- https://github.com/FasterXML/jackson-databind/commit/24529da29fdf46ff94ca38de9ebf31cd188f5e8e
- https://access.redhat.com/security/cve/CVE-2026-54513vdb-entry
- RHBZ#2492010issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54513.json
- https://access.redhat.com/errata/RHSA-2026:48095vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:48151vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:50847vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:50849vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:44271vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:43400vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:43218vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:44062vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:44061vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:44066vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:44063vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:44065vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:44064vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:40895vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:66545vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:66488vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36839vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:41951vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:62260vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:54622vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:50846vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:50848vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:54435vendor-advisory
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