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Fencer Intel
medium 5.6

CVE-2026-83557 json

jackson-databind omits java.lang.Comparable from DefaultBaseTypeLimitingValidator's unsafe base types

published 2mo ago modified last mo. also EUVD-2026-69250 , GHSA-gx83-3vf8-gh7j

cvss
5.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

DefaultBaseTypeLimitingValidator is the PolymorphicTypeValidator applied automatically whenever @JsonTypeInfo is used without an explicitly configured custom validator. It denies polymorphic resolution only for a fixed set of "unsafe base types", and its isSafeSubType method returns true unconditionally for every base type outside that set. java.lang.Comparable was absent from the list despite being implemented by a very large fraction of JDK and application classes, comparable in breadth to java.io.Serializable, which is on the list for that reason. An application declaring an @JsonTypeInfo-annotated property or class with Comparable as its base type, and no custom PolymorphicTypeValidator, will accept a type identifier for essentially any class implementing Comparable. This yields an attacker-controlled object instantiation primitive; a demonstrated case constructs a java.io.File for an arbitrary attacker-chosen path, which becomes path-traversal-adjacent if the application subsequently calls path-sensitive methods on the value. No class implementing Comparable has been identified that yields code execution through deserialization alone. Global Default Typing via activateDefaultTyping is not affected, because that method structurally requires an explicit PolymorphicTypeValidator argument. This affects com.fasterxml.jackson.core:jackson-databind from 2.11.0 before 2.18.10, from 2.19.0 before 2.21.6, and from 2.22.0 before 2.22.2, and tools.jackson.core:jackson-databind from 3.0.0 before 3.1.6 and from 3.2.0 before 3.2.2. Users should upgrade to 2.18.10, 2.21.6, 2.22.2, 3.1.6, or 3.2.2.

Patch / fix

  • maven tools.jackson.core:jackson-databind 3.1.6, 3.2.2
  • maven com.fasterxml.jackson.core:jackson-databind 2.18.10, 2.21.6, 2.22.2
  • FasterXML jackson-databind 2.18.10, 2.21.6, 2.22.2, 3.1.6, 3.2.2
  • jackson-databind Debian 14 2.18.11-1

debian advisories DEBIAN-CVE-2026-83557

  • jackson-databind SLES for SAP applications 16.0, SLES 16.0 2.18.11-160000.1.1
  • jackson-core SLES for SAP applications 16.0, SLES 16.0 2.18.11-160000.1.1
  • jackson-annotations SLES for SAP applications 16.0, SLES 16.0 2.18.11-160000.1.1
  • jackson-core SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.18.11-150200.3.30.1
  • jackson-databind SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.18.11-150200.3.36.1
  • jackson-annotations SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.18.11-150200.3.28.1
  • jackson-dataformat-xml SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.18.11-150200.5.8.1
  • jackson-dataformats-binary SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.18.11-150200.3.29.1

suse advisories SUSE-SU-2026:24149-1SUSE-SU-2026:4394-1

  • jackson-databind openSUSE Leap 16.0 2.18.11-160000.1.1
  • jackson-core openSUSE Leap 16.0 2.18.11-160000.1.1
  • jackson-annotations openSUSE Leap 16.0 2.18.11-160000.1.1
  • jackson-databind openSUSE Tumbleweed 2.18.11-1.1

opensuse advisories openSUSE-SU-2026:22034-1openSUSE-SU-2026:11877-1

Is CVE-2026-83557 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-83557 updated cvss 5.6

com.fasterxml.jackson.core/jackson-databind: tools.jackson.core/jackson-databind: jackson-databind: Path traversal via incomplete type validation

  • Red Hat Exploit Intelligence exploit-intelligence/agent-client-rhel9 Red Hat OpenShift Developer Tools and Services ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9, jenkins 2.516.3.1758206866-3.el9, jenkins-2-plugins 4.19.1758207171-1.el9
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat OpenShift Serverless openshift-serverless-1/kn-ekb-receiver-rhel9, openshift-serverless-1/kn-ekb-dispatcher-rhel9, openshift-serverless-1/kn-eventing-integrations-log-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9, +4 more Red Hat AI Inference Server rhaii/vllm-gaudi-rhel9, rhaiis/vllm-cuda-rhel9 Red Hat AMQ Broker 7 jackson-databind 2.22.1.redhat-00003
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-24/de-minimal-rhel8, ansible-automation-platform-24/de-minimal-rhel9, ansible-automation-platform-25/de-minimal-rhel8, ansible-automation-platform-25/de-minimal-rhel9, ansible-automation-platform-26/de-minimal-rhel9, ansible-automation-platform-27/de-minimal-rhel9, +5 more
    affected: workaround, no fix available, no fix planned “Out of support scope”
  • Red Hat build of Apache Camel 4 for Quarkus 3 jackson-databind 2.22.1.redhat-00003 Red Hat build of Apache Camel for Spring Boot 4 jackson-databind 2.22.1.redhat-00003
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Apicurio Registry 3 jackson-databind 2.22.1.redhat-00003
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat build of Debezium 3 jackson-databind 2.22.1.redhat-00003
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Build of Keycloak rhbk/keycloak-rhel9, keycloak/rhbk-rhel9-operator, rhbk/keycloak-rhel9-operator, keycloak/rhbk-openshift-rhel9, jackson-databind 2.22.1.redhat-00003
    affected: workaround, no fix available, no fix planned “Out of support scope”
  • Red Hat Ceph Storage 6 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +16 more
    affected: workaround, no fix planned “Out of support scope”
show 11 more
  • Red Hat Ceph Storage 7 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +16 more Red Hat Ceph Storage 8 ceph, cephadm, liborc1, librbd1, librgw2, rbd-nbd, +18 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Ceph Storage 9 ceph, liborc, cephadm, liborc2, librbd1, librgw2, +21 more
    affected: workaround, no fix available, no fix planned “Out of support scope”
  • Red Hat Certificate System 10 redhat-pki 10.13.14-1.module+el8pki+24697+be195eea
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Certificate System 11 redhat-pki 11.10.1-1.el10_2 Red Hat Data Grid 8 jackson-databind 2.22.1.redhat-00003 Red Hat Enterprise Linux 8 jss, pki-ca, idm-jss, ldapjdk, pki-kra, pki-acme, +27 more Red Hat Enterprise Linux 9 pki-ca, pki-kra, pki-acme, pki-base, pki-core, pki-tools, +17 more Red Hat Enterprise Linux 10 ceph, dogtag-pki 11.9.0-5.el10, assertj-core 3.24.2-10.el10 Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-gaudi-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Fuse 7 jackson-databind 2.22.1.redhat-00003 Red Hat JBoss Enterprise Application Platform 7 jackson-databind 2.22.1.redhat-00003, jboss-eap-7/eap74-els-openjdk8-openshift-rhel8, jboss-eap-7/eap74-els-openjdk11-openshift-rhel8, jboss-eap-7/eap74-els-openjdk17-openshift-rhel8
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat JBoss Enterprise Application Platform 8 jackson-databind 2.22.1.redhat-00003 Red Hat JBoss Enterprise Application Platform Expansion Pack jackson-databind 2.22.1.redhat-00003 Red Hat JBoss Web Server 7 jboss-webserver-7/jws70-openjdk17-openshift-rhel9, jboss-webserver-7/jws70-openjdk17-rhel9-openshift, jboss-webserver-7/jws70-openjdk21-openshift-rhel9, jboss-webserver-7/jws70-openjdk21-rhel9-openshift Red Hat Lightspeed for Runtimes Operator rh-lightspeed-runtimes/runtimes-agent-init-rhel9 Red Hat Offline Knowledge Portal offline-knowledge-portal/rhokp-rhel9 Red Hat OpenShift AI (RHOAI) rhoai/odh-modelmesh-rhel9, rhoai/odh-vllm-gaudi-rhel9, rhoai/odh-spark-operator-rhel9, rhoai/odh-trustyai-service-rhel9, rhoai/odh-th-torch-cpu-py312-rhel9, rhoai/odh-th-torch-cuda-py312-rhel9, +20 more
    +2 more products
    Red Hat OpenShift Dev Spaces devspaces/server-rhel9, devspaces/openvsx-rhel9, devspaces/pluginregistry-rhel9, devspaces/multicluster-redirector-rhel9 Red Hat Satellite 6 candlepin, puppetserver, candlepin-selinux, openvox-server 8.14.1-1.el9sat
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Single Sign-On 7 jackson-databind 2.22.1.redhat-00003
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat build of Quarkus 3.27.6.redhat jackson-databind 2.21.7.redhat-00001
    fixed: vendor fix RHSA-2026:83082
  • Red Hat build of Quarkus 3.33.4.redhat jackson-databind 2.21.7.redhat-00001
    fixed: vendor fix RHSA-2026:83520
  • Red Hat build of Quarkus 3.27.6.redhat jna 5.8.0, db2 1.21.4, h2 2.3.230, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, +1009 more Red Hat build of Quarkus 3.33.4.redhat jna 5.8.0, h2 2.4.240, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, wasm 2.15.3, +1016 more
    not affected: vulnerable code not present
  • Red Hat Hardened Images maven3.9 3.9.16-0.1.hum1
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2mo ago

Exploit prediction

0.72% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-gx83-3vf8-gh7j referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.6 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
GitHub 3.1 5.6 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem package affected fixed in
maven tools.jackson.core:jackson-databind
>=3.0.0, <3.1.6
>=3.2.0, <3.2.2
3.1.6
3.2.2
maven com.fasterxml.jackson.core:jackson-databind
>=2.11.0, <2.18.10
>=2.19.0, <2.21.6
>=2.22.0, <2.22.2
2.18.10
2.21.6
2.22.2

Affected products

  • FasterXML jackson-databind

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data
  • CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.