CVE-2026-54512 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-54512HIGH

FasterXML jackson-databind — jackson-databind: PolymorphicTypeValidator bypass via generic type parameters allows arbitrary class instantiation

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   N   N  U  H  H  H    8.1   .0078   53.1     —

AFFECTED
  Product           Versions               Fixed
  jackson-databind  >= 2.10.0, < 2.18.8 –  —

TIMELINE
  Jun 15  Reserved by GitHub_M
  Jun 23  EXPLOIT PUBLISHED — CVE-2026-54512 (FasterXML jackson-databind). Public exploit reference added.
  Jun 23  Published (CNA: GitHub_M)

CWE-184, CWE-502 · CNA: GitHub_M · CVSS v3.1 · 3 references · NVD status: Analyzed

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, jackson-databind's PolymorphicTypeValidator (PTV) is the primary safety mechanism guarding polymorphic deserialization. When polymorphic typing is enabled and a type identifier contains generic parameters (i.e. the type ID string contains <), DatabindContext._resolveAndValidateGeneric() validates only the raw container class name (the substring before <) against the configured PTV. If the container type is approved, the method parses the full canonical type string via TypeFactory.constructFromCanonical() and returns the fully parameterized type without ever validating the nested type arguments against the PTV. The nested type arguments are then resolved, instantiated, and populated as beans during deserialization. An attacker who controls the type ID can therefore place a denied class as a generic type parameter of an allowed container — for example java.util.ArrayList<com.evil.Gadget> when only java.util.ArrayList is allow-listed. The container passes the PTV check; com.evil.Gadget is loaded via Class.forName(name, true, loader), instantiated, and its properties are set from attacker-controlled JSON. This completely bypasses an explicitly configured PTV allow-list. This vulnerability is fixed in 2.18.8, 2.21.4, and 3.1.4.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 15, 2026	Reserved	Reserved by GitHub_M
June 23, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-54512 (FasterXML jackson-databind). Public exploit reference added.
June 23, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
FasterXML	jackson-databind	—	>= 2.10.0, < 2.18.8	—

Weaknesses

CWE-184 · CWE-502

References (3)

https://github.com/FasterXML/jackson-databind/commit/434d6c511de7fdd9872f29157aafb6162d12d8d5 [Patch]
https://github.com/FasterXML/jackson-databind/issues/5988 [Issue Tracking, Patch]
https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-j3rv-43j4-c7qm [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-54512 at cve.org

Vendors: fasterxml

Weaknesses: CWE-184 · CWE-502

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-54512 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.