CVE-2026-54513: jackson-databind has an array subtype allowlist bypass in BasicPolymorphicTypeValidator (allowIfSubTypeIsArray)
(updated )
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.
References
- access.redhat.com/errata/RHSA-2026:36839
- access.redhat.com/errata/RHSA-2026:40895
- access.redhat.com/errata/RHSA-2026:41951
- access.redhat.com/errata/RHSA-2026:43218
- access.redhat.com/errata/RHSA-2026:43400
- access.redhat.com/errata/RHSA-2026:44061
- access.redhat.com/errata/RHSA-2026:44062
- access.redhat.com/errata/RHSA-2026:44063
- access.redhat.com/errata/RHSA-2026:44064
- access.redhat.com/errata/RHSA-2026:44065
- access.redhat.com/errata/RHSA-2026:44066
- access.redhat.com/errata/RHSA-2026:44271
- access.redhat.com/errata/RHSA-2026:48095
- access.redhat.com/errata/RHSA-2026:48151
- access.redhat.com/errata/RHSA-2026:50846
- access.redhat.com/errata/RHSA-2026:50847
- access.redhat.com/errata/RHSA-2026:50848
- access.redhat.com/errata/RHSA-2026:50849
- access.redhat.com/errata/RHSA-2026:54435
- access.redhat.com/errata/RHSA-2026:54622
- access.redhat.com/errata/RHSA-2026:62260
- access.redhat.com/errata/RHSA-2026:66488
- access.redhat.com/errata/RHSA-2026:66545
- access.redhat.com/security/cve/CVE-2026-54513
- bugzilla.redhat.com/show_bug.cgi?id=2492010
- github.com/FasterXML/jackson-databind/commit/01d1692c8d0ed03e51a0e3c4f8a9e6908e4931e5
- github.com/FasterXML/jackson-databind/commit/24529da29fdf46ff94ca38de9ebf31cd188f5e8e
- github.com/FasterXML/jackson-databind/issues/5981
- github.com/FasterXML/jackson-databind/issues/5983
- github.com/FasterXML/jackson-databind/pull/5984
- github.com/FasterXML/jackson-databind/security/advisories/GHSA-rmj7-2vxq-3g9f
- github.com/advisories/GHSA-rmj7-2vxq-3g9f
- nvd.nist.gov/vuln/detail/CVE-2026-54513
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54513.json
Code Behaviors & Features
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