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jackson-databind CVE-2026-54513

| EUVDEUVD-2026-38593 HIGH
Incomplete List of Disallowed Inputs (CWE-184)
2026-06-23 security-advisories@github.com GHSA-rmj7-2vxq-3g9f
Authentication Bypass Jackson Databind
8.1
CVSS 3.1 · Vendor: github
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Severity by source

Vendor (github) PRIMARY
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
8.1 HIGH

Network-reachable JSON input with no auth, but AC:H because exploitation requires a specific PTV builder configuration and a usable classpath gadget; full CIA impact via deserialization.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
8.1 HIGH
qualitative

Primary rating from Vendor (github).

CVSS VectorVendor: github

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch available
Jun 23, 2026 - 22:02 EUVD
Source Code Evidence Fetched
Jun 23, 2026 - 21:32 vuln.today
Analysis Generated
Jun 23, 2026 - 21:32 vuln.today

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 7,611 maven packages depend on com.fasterxml.jackson.core:jackson-databind (2,137 direct, 5,569 indirect)
  • 370 maven packages depend on tools.jackson.core:jackson-databind (101 direct, 269 indirect)

Ecosystem-wide dependent count for version 2.10.0 and other introduced versions.

DescriptionCVE.org

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.

AnalysisAI

Allowlist bypass in jackson-databind's BasicPolymorphicTypeValidator (PTV) allows attackers to instantiate non-allowlisted classes by wrapping them in arrays (e.g., EvilType[]), defeating a control intended to block deserialization gadget chains. Affects versions 2.10.0 through 2.18.7, 2.19.0 through 2.21.3, and 3.0.0 through 3.1.3 when applications use allowIfSubTypeIsArray() alongside an explicit concrete-type allowlist. No public exploit identified at time of analysis, but the upstream fix and full root-cause writeup are public on GitHub.

Technical ContextAI

jackson-databind is the FasterXML data-binding layer for the Jackson JSON processor and the de-facto JSON library across the Java ecosystem. PolymorphicTypeValidator (PTV), introduced in 2.10.0, is the safeguard added after the long history of Jackson deserialization-gadget CVEs; BasicPolymorphicTypeValidator.Builder.allowIfSubTypeIsArray() was supposed to permit array container types while still relying on the validator to gate concrete component types. The validator only checked clazz.isArray() and never recursed into the component type, so when Default Typing or @JsonTypeInfo carried no per-element type IDs, Jackson instantiated the component class through normal bean deserialization with no second PTV invocation - the textbook CWE-184 (Incomplete List of Disallowed Inputs), with CWE-502 (Unsafe Deserialization) as the downstream impact class. The fix replaces the always-true array matcher with an _acceptArrayTypes flag that unwraps arrays recursively and validates the innermost element type against the configured matchers.

RemediationAI

Vendor-released patches: upgrade to jackson-databind 2.18.8, 2.21.4, or 3.1.4 depending on your branch (released 2026-06-04, see GHSA-rmj7-2vxq-3g9f and PRs #5983 and #5984). Note a behavior change: after upgrading, allowIfSubTypeIsArray() now validates element types, so callers that implicitly relied on 'allow every array' must also allowlist the concrete element types they expect, or array deserialization will start failing - review serialization tests before rolling to production. If immediate patching is not possible, remove the allowIfSubTypeIsArray() call from your PTV configuration and instead explicitly allowlist the concrete element classes you need with allowIfSubType(Class) (trade-off: code change and possible loss of legitimate array support); alternatively avoid Default Typing entirely and use @JsonTypeInfo with a tight type ID resolver, which routes per-element types back through PTV.

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Same weakness CWE-184 – Incomplete List of Disallowed Inputs

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-54513 vulnerability details – vuln.today
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