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Fencer Vulns
high 8.8

CVE-2026-29063 json

Immutable.js: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in immutable

published 2026-03-04 8 mo ago modified 2026-10-30 10 d ago also GHSA-wf6x-7x77-mvgw , EUVD-2026-10057

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits
0
none known

Summary

Immutable.js provides many Persistent Immutable data structures. Prior to versions 3.8.3, 4.3.7, and 5.1.5, Prototype Pollution is possible in immutable via the mergeDeep(), mergeDeepWith(), merge(), Map.toJS(), and Map.toObject() APIs. This issue has been patched in versions 3.8.3, 4.3.7, and 5.1.5.

Patch / fix

  • npm immutable 3.8.3, 4.3.8, 5.1.5
  • Red Hat Cluster Observability Operator 1.5.0 1782839279, 1782839996, 1782840539
  • Red Hat Migration Toolkit for Virtualization 2.1 1779139872
  • Red Hat Migration Toolkit for Virtualization 2.9 1778927462
  • Red Hat multicluster engine for Kubernetes 2.1 1777128790
  • Red Hat multicluster engine for Kubernetes 2.11 1777559392
  • Red Hat multicluster engine for Kubernetes 2.6 1776223790
  • Red Hat multicluster engine for Kubernetes 2.7 1777306226
  • Red Hat multicluster engine for Kubernetes 2.8 1775116156
  • Red Hat multicluster engine for Kubernetes 2.9 1777301444
  • Red Hat Network Observability (NETOBSERV) 1.11.0 1774431617
  • Red Hat Network Observability (NETOBSERV) 1.12.2 1780920979
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14 1783451729
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.15 1776927126
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 1777559387
  • Red Hat Red Hat Advanced Cluster Security 4.8 1777307791
  • Red Hat Red Hat Advanced Cluster Security 4.9 1777986630
  • Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.10 1777976489
  • Red Hat Red Hat Developer Hub 1.8 1776784286
  • Red Hat Red Hat Developer Hub 1.9 1777903262
  • Red Hat Red Hat Discovery 2 1775675922
  • Red Hat Red Hat Edge Manager 1.0 1783502438, 1783502765
  • Red Hat Red Hat Edge Manager 1.1 1784126822, 1784127736, 1784194574, 1784194938
  • Red Hat Red Hat Migration Toolkit 1.8 1783690532
  • Red Hat Red Hat OpenShift AI 2.25 1780467029, 1780467147
  • Red Hat Red Hat OpenShift AI 3.3 1778473763, 1778666987, 1779189627
  • Red Hat Red Hat OpenShift Container Platform 4.12 1782276534
  • Red Hat Red Hat OpenShift Container Platform 4.13 1784055834
  • Red Hat Red Hat OpenShift Container Platform 4.14 1782157414
  • Red Hat Red Hat OpenShift Container Platform 4.15 1782127091
  • node-immutable Debian 14 4.3.8-1

debian advisories DEBIAN-CVE-2026-29063

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-2026-29063 updated cvss 8.8

immutable-js: Immutable.js: Arbitrary code execution via Prototype Pollution

  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/logging-view-plugin-rhel9 Red Hat Migration Toolkit for Virtualization mtv-candidate/mtv-console-plugin-rhel9
    affected: no fix planned “Will not fix”
  • Red Hat Network Observability Operator network-observability/network-observability-console-plugin-compat-rhel9 Red Hat Node HealthCheck Operator workload-availability/node-remediation-console-rhel8, workload-availability/node-remediation-console-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-console-plugin-rhel9, openshift-lightspeed/lightspeed-console-plugin-pf5-rhel9
    affected: no fix available
  • Red Hat OpenShift Pipelines openshift-pipelines/pipelines-console-plugin-rhel8
    affected: no fix planned “Will not fix”
  • Red Hat 3scale API Management Platform 2 3scale-amp20/system, 3scale-amp21/system, 3scale-amp22/system, 3scale-amp24/system, 3scale-amp25/system, 3scale-amp26/system, +3 more Red Hat Ansible Automation Platform 2 ansible-automation-platform/automation-dashboard-rhel9, ansible-automation-platform-tech-preview/automation-dashboard-rhel9
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat build of Apicurio Registry 2 io.apicurio-apicurio-registry Red Hat Connectivity Link 1 rhcl-1/rhcl-console-plugin-rhel9
    affected: no fix available
  • Red Hat Enterprise Linux 9 gjs, grafana, grafana-selinux
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 10 grafana Red Hat OpenShift AI (RHOAI) rhoai/odh-mod-arch-maas-rhel9
    affected: no fix available
  • Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9, openshift-gitops-1/console-plugin-rhel8
    affected: no fix available, no fix planned “Will not fix”
show 24 more
  • Red Hat OpenShift Virtualization 4 container-native-virtualization/kubevirt-console-plugin-rhel9 Red Hat Satellite 6 nodejs-connected-react-router Red Hat Self-service automation portal 2 ansible-automation-platform/automation-portal
    affected: no fix available
  • Red Hat Cluster Observability Operator 1.5 cluster-observability-operator/logging-console-plugin-pf4-rhel9 1782839279, cluster-observability-operator/logging-console-plugin-pf5-rhel9 1782840539, cluster-observability-operator/troubleshooting-panel-console-plugin-pf6-rhel9 1782839996
    fixed: vendor fix RHSA-2026:34342
  • Red Hat Migration Toolkit for Virtualization 2.9 migration-toolkit-virtualization 1778927462
    fixed: vendor fix RHSA-2026:19410
  • Red Hat Migration Toolkit for Virtualization 2.10 migration-toolkit-virtualization 1779139872
    fixed: vendor fix RHSA-2026:19409
  • Red Hat multicluster engine for Kubernetes 2.6 multicluster-engine 1776223790
    fixed: vendor fix RHSA-2026:9848
  • Red Hat multicluster engine for Kubernetes 2.7 multicluster-engine 1777306226
    fixed: vendor fix RHSA-2026:11858
  • Red Hat multicluster engine for Kubernetes 2.8 multicluster-engine 1775116156
    fixed: vendor fix RHSA-2026:8218
  • Red Hat multicluster engine for Kubernetes 2.9 multicluster-engine 1777301444
    fixed: vendor fix RHSA-2026:11414
  • Red Hat multicluster engine for Kubernetes 2.10 multicluster-engine 1777128790
    fixed: vendor fix RHSA-2026:13542
  • Red Hat multicluster engine for Kubernetes 2.11 multicluster-engine 1777559392
    fixed: vendor fix RHSA-2026:13853
  • Red Hat Network Observability (NETOBSERV) 1.11.0 network-observability 1774431617
    fixed: vendor fix RHSA-2026:6428
  • Red Hat Network Observability (NETOBSERV) 1.12.3 network-observability/network-observability-console-plugin-pf4-rhel9 1780920979
    fixed: vendor fix RHSA-2026:24473
  • Red Hat Advanced Cluster Management for Kubernetes 2.14 rhacm2/console-rhel9 1783451729
    fixed: vendor fix RHSA-2026:36882
  • Red Hat Advanced Cluster Management for Kubernetes 2.15 rhacm2 1776927126
    fixed: vendor fix RHSA-2026:13548
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2 1777559387
    fixed: vendor fix RHSA-2026:13847
  • Red Hat Advanced Cluster Security 4.8 advanced-cluster-security 1777307791
    fixed: vendor fix RHSA-2026:11070
  • Red Hat Advanced Cluster Security 4.9 advanced-cluster-security 1777986630
    fixed: vendor fix RHSA-2026:13791
  • Red Hat Advanced Cluster Security for Kubernetes for IBM Power, little endian 4.10 advanced-cluster-security 1777976489
    fixed: vendor fix RHSA-2026:13829
  • Red Hat Developer Hub 1.8 rhdh 1776784286
    fixed: vendor fix RHSA-2026:9742
  • Red Hat Developer Hub 1.9 rhdh 1777903262
    fixed: vendor fix RHSA-2026:13826
  • Red Hat Discovery 2 discovery 1775675922
    fixed: vendor fix RHSA-2026:7329
  • Red Hat Edge Manager 1.0 rhem/flightctl-ui-rhel9 1783502438, rhem/flightctl-ui-ocp-rhel9 1783502765
    fixed: vendor fix RHSA-2026:36651
  • Red Hat Edge Manager 1.1 rhem/flightctl-ui-rhel9 1784127736, rhem/flightctl-ui-rhel10 1784194574, rhem/flightctl-ui-ocp-rhel9 1784126822, rhem/flightctl-ui-ocp-rhel10 1784194938
    fixed: vendor fix RHSA-2026:40945
  • Red Hat Migration Toolkit 1.8 rhmtc/openshift-migration-ui-rhel8 1783690532
    fixed: vendor fix RHSA-2026:41928

30 more fixed, 54 more not affected in the full advisory

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
none
Automatable
yes
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.99% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/immutable-js/immutable-js/security/advisories/GHSA-wf6x-7x77-mvgw referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
npm immutable
>=4.0.0-rc.1, <4.3.8
>=5.0.0, <5.1.5
<3.8.3
4.3.8
5.1.5
3.8.3

Affected products

  • immutable-js immutable-js
  • Red Hat Cluster Observability Operator 1.5.0
  • Red Hat Migration Toolkit for Virtualization 2.1
  • Red Hat Migration Toolkit for Virtualization 2.9
  • Red Hat multicluster engine for Kubernetes 2.1
  • Red Hat multicluster engine for Kubernetes 2.11
  • Red Hat multicluster engine for Kubernetes 2.6
  • Red Hat multicluster engine for Kubernetes 2.7
  • Red Hat multicluster engine for Kubernetes 2.8
  • Red Hat multicluster engine for Kubernetes 2.9
  • Red Hat Network Observability (NETOBSERV) 1.11.0
  • Red Hat Network Observability (NETOBSERV) 1.12.2
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.15
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16
  • Red Hat Red Hat Advanced Cluster Security 4.8
  • Red Hat Red Hat Advanced Cluster Security 4.9
  • Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.10
  • Red Hat Red Hat Developer Hub 1.8
  • Red Hat Red Hat Developer Hub 1.9
  • Red Hat Red Hat Discovery 2
  • Red Hat Red Hat Edge Manager 1.0
  • Red Hat Red Hat Edge Manager 1.1
  • Red Hat Red Hat Migration Toolkit 1.8
  • Red Hat Red Hat OpenShift AI 2.25
  • Red Hat Red Hat OpenShift AI 3.3
  • Red Hat Red Hat OpenShift Container Platform 4.12
  • Red Hat Red Hat OpenShift Container Platform 4.13
  • Red Hat Red Hat OpenShift Container Platform 4.14
  • Red Hat Red Hat OpenShift Container Platform 4.15
  • Red Hat Red Hat OpenShift Container Platform 4.16
  • Red Hat Red Hat OpenShift Container Platform 4.17
  • Red Hat Red Hat OpenShift Container Platform 4.18
  • Red Hat Red Hat OpenShift Container Platform 4.19
  • Red Hat Red Hat OpenShift Container Platform 4.20
  • Red Hat Red Hat OpenShift Container Platform 4.21
  • Red Hat Red Hat Openshift Data Foundation 4.18
  • Red Hat Red Hat Openshift Data Foundation 4.19
  • Red Hat Red Hat Openshift Data Foundation 4.20
  • Red Hat Red Hat OpenShift Pipelines 1.2
  • Red Hat Red Hat OpenShift Service Mesh 2.6
  • Red Hat Red Hat OpenShift Service Mesh 3.0
  • Red Hat Red Hat OpenShift Service Mesh 3.1
  • Red Hat Red Hat OpenShift Service Mesh 3.2
  • Red Hat Red Hat OpenShift Service Mesh 3.3
  • Red Hat Red Hat Quay 3.10
  • Red Hat Red Hat Quay 3.12
  • Red Hat Red Hat Quay 3.15
  • Red Hat Red Hat Quay 3.16
  • Red Hat Red Hat Quay 3.17

Classification

Weakness
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
  • CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes

References

Sources

Fencer Vulns 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.