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Public proof of conceptFix available

CVE-2026-54512

A public proof of concept exists; no exploitation attested.

  • Published2026-06-23
  • Fixed in3.1.4 · 2.21.4 · 2.18.8
  • WeaknessCWE-184 · CWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-06-2321:17CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-54512?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-54512?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Fasterxml jackson-databind
BranchAffectedFixed in
3.x≥ 3.0.0, < 3.1.43.1.4
2.x≥ 2.19.0, < 2.21.42.21.4
2.x≥ 2.10.0, < 2.18.82.18.8

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • idm-pki-caAlmaLinux:10all versions · fixed in 11.9.0-4.el10_2.alma.1and 7 other packages
  • pki-jackson-annotationsAlmaLinux:9all versions · fixed in 2.21-1.el9_8
  • pki-jackson-coreAlmaLinux:9all versions · fixed in 2.21.4-1.el9_8and 4 other packages

Vendor advisories

  • CVE-2026-54512 Red Hat Product Security1,394 products fixed · 48 known affected

    jackson-databind: jackson-databind: Arbitrary code execution via PolymorphicTypeValidator bypass

    jenkins-2-plugins.src as a component of OpenShift Developer Tools and Services · jenkins.src as a component of OpenShift Developer Tools and Services · openshift-serverless-1/kn-ekb-dispatcher-rhel9 as a component of OpenShift Serverless · +45 more

  • RHSA-2026:76128 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Single Sign-On 7.6.13 security update on RHEL 7

  • RHSA-2026:76130 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Single Sign-On 7.6.13 security update on RHEL 9

  • RHSA-2026:76129 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Single Sign-On 7.6.13 security update on RHEL 8

  • RHSA-2026:76637 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Apicurio Registry (container images) release and security update [ 3.3.3 GA ]

  • RHSA-2026:76134 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Single Sign-On 7.6.13 for OpenShift image security update

53 more advisories

Full record on NVD

Fix

  1. Update Fasterxml jackson-databind to 3.1.4 · 2.21.4 · 2.18.8
  2. Vendor fix Red Hat Product Security RHSA-2026:76128 · 3 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Red Hat Product Security RHSA-2026:76637 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  4. Vendor fix Red Hat Product Security RHSA-2026:76132 · 1 productBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on. The References section of this erratum contains a download link (you must log in to download the update).
  5. Vendor fix Red Hat Product Security RHSA-2026:76043 · 1 productThe container disk images provided by this update can be downloaded from the Red Hat container registry at registry.redhat.io using the "podman pull" command, for use with OpenShift Virtualization. For details on deploying and configuring RHEL AI, see the Red Hat Enterprise Linux AI documentation …
  6. Vendor fix Red Hat Product Security RHSA-2026:76041 · 5 productsThe container images provided by this update can be downloaded from the Red Hat container registry at registry.redhat.io using the "podman pull" command. For details on deploying and configuring RHEL AI, see the Red Hat Enterprise Linux AI documentation at https://docs.redhat.com/en/documentation/…
  7. Vendor fix Red Hat Product Security RHSA-2026:70277 · 1 productBefore applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://acce…

Advisories and patches

Detection

read 2026-10-23 19:25 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
2 repositories, unverifiedavergnaud/flight-sql-jdbc-driver-cve-2026-54512cklinisme/doris-spark-connector-cve
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionpoc2026-06-24
  • OpenCVESSVC decisionpoc—
  • CNACVSS 3.18.1read 2026-10-23
  • CNAweakness (CWE)CWE-184, CWE-502read 2026-10-23
  • FIRST EPSSEPSS score0.9 %2026-10-22
  • PoC-in-GitHubproof of concept2read 2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-06-23
Last Modified
2026-06-27
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-54512?

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.

Is CVE-2026-54512 actively exploited?

A proof-of-concept exploit exists for CVE-2026-54512, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-54512?

CVE-2026-54512 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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