8.1

CVE-2026-54513: jackson-databind: Array subtype allowlist bypass in BasicPolymorphicTypeValidator (allowIfSubTypeIsArray)

Modified
AliasesRHSA-2026:43218UBUNTU-CVE-2026-54513DEBIAN-CVE-2026-54513
Published 23-06-2026Last modified 14-09-2026

Vulnerability summary

CVE-2026-54513 is a high (CVSS 8.1) Incomplete List of Disallowed Inputs vulnerability in fasterxml jackson-databind. EPSS estimates a 1.23% chance of exploitation in the next 30 days, higher than 68.8% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 8.1 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
1.23%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 17 · Related 5
OPENSUSE-SU-2026:11118-1OPENSUSE-SU-2026:21201-1RHSA-2026:40895RHSA-2026:43400RHSA-2026:44061RHSA-2026:44062

Timeline

  1. 23-06-2026
    PublishedVulnerability first disclosed.
  2. 14-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

8 scores · 8 sources · 1 version

EPSS trend

Probability

1.23%

Chance of exploitation in the next 30 days

Percentile

69%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.23% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard200 products
  • airbyte-server< 2.0.0-r3
  • airbyte-server-fips< 2.0.0-r3
  • airflow-2All versions (No fix recorded)
  • airflow-3< 3.3.0-r3
  • airflow-3-iamguarded-compatAll versions (No fix recorded)

1 vendor · 200 products · Showing 200 of 695

References

41 links
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