How severe is CVE-2026-54513?

CVE-2026-54513 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-54513 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-54513?

CVE-2026-54513 affects Fasterxml Jackson-databind. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-54513?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-54513 have an EU (EUVD) identifier?

Yes. CVE-2026-54513 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38593.

When was CVE-2026-54513 published?

CVE-2026-54513 was published on 2026-06-23 and last updated on 2026-07-03.

CVE-2026-54513

CVE-2026-54513 is a high-severity vulnerability in Fasterxml Jackson-databind with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-184.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38593
Weakness: CWE-184
Affected product: Fasterxml Jackson-databind
Published: 2026-06-23
Last modified: 2026-07-03

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.

Frequently asked questions

What is CVE-2026-54513?: 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.
How severe is CVE-2026-54513?: CVE-2026-54513 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-54513 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-54513?: CVE-2026-54513 affects Fasterxml Jackson-databind. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-54513?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-54513 have an EU (EUVD) identifier?: Yes. CVE-2026-54513 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38593.
When was CVE-2026-54513 published?: CVE-2026-54513 was published on 2026-06-23 and last updated on 2026-07-03.

References

Affected products (1)

cpe:2.3:a:fasterxml:jackson-databind:*:*:*:*:*:*:*:*

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