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Fencer Intel
high 8.8

CVE-2025-59331 json

is-arrayish@0.3.3 contains malware after npm account takeover

published last yr. modified 4mo ago also GHSA-frh7-2f84-v9mw , GHSA-hfm8-9jrf-7g9w , EUVD-2025-29241

cvss
8.8
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

is-arrayish checks if an object can be used like an Array. On 8 September 2025, an npm publishing account for is-arrayish was taken over after a phishing attack. Version 0.3.3 was published, functionally identical to the previous patch version, but with a malware payload added attempting to redirect cryptocurrency transactions to the attacker's own addresses from within browser environments. Local environments, server environments, command line applications, etc. are not affected. If the package was used in a browser context (e.g. a direct <script> inclusion, or via a bundling tool such as Babel, Rollup, Vite, Next.js, etc.) there is a chance the malware still exists and such bundles will need to be rebuilt. The malware seemingly only targets cryptocurrency transactions and wallets such as MetaMask. See references below for more information on the payload. npm removed the offending package from the registry over the course of the day on 8 September, preventing further downloads from npm proper. On 13 September, the package owner published new patch versions to help cache-bust those using private registries who might still have the compromised version cached. Users should update to the latest patch version, completely remove their node_modules directory, clean their package manager's global cache, and rebuild any browser bundles from scratch. Those operating private registries or registry mirrors should purge the offending versions from any caches. This issue is resolved in 0.3.4.

Patch / fix

  • npm is-arrayish 0.3.4

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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-2025-59331 updated

is-arrayish: is-arrayish@0.3.3 contains malware after npm account takeover

  • Red Hat Cryostat 4 io.cryostat-cryostat Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9 Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/vector-rhel9, openshift-logging/kibana6-rhel8, openshift-logging/eventrouter-rhel9, openshift-logging/cluster-logging-rhel9-operator, openshift-logging/log-file-metric-exporter-rhel9, openshift-logging/cluster-logging-operator-bundle Red Hat Migration Toolkit for Applications 8 mta/mta-ui-rhel9, mta-static-report-container Red Hat Migration Toolkit for Virtualization mtv-candidate/mtv-console-plugin-rhel9, migration-toolkit-virtualization/mtv-console-plugin-rhel9 Red Hat Multicluster Engine for Kubernetes multicluster-engine/console-mce-rhel8, multicluster-engine/console-mce-rhel9
    +34 more products
    Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-grafana-rhel9 Red Hat Network Observability Operator network-observability/network-observability-console-plugin-rhel9 Red Hat Node HealthCheck Operator workload-availability/node-remediation-console-rhel9, workload-availability/node-healthcheck-rhel9-operator, workload-availability/node-healthcheck-operator-bundle, workload-availability/node-healthcheck-must-gather-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-console-plugin-rhel9 Red Hat OpenShift Pipelines openshift-pipelines/pipelines-hub-ui-rhel8, openshift-pipelines/pipelines-hub-ui-rhel9, openshift-pipelines/pipelines-hub-api-rhel8, openshift-pipelines/pipelines-hub-api-rhel9, openshift-pipelines/pipelines-console-plugin-rhel8, openshift-pipelines/pipelines-console-plugin-rhel9, +2 more Red Hat OpenShift Serverless openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel8 Red Hat OpenShift Service Mesh 2 openshift-service-mesh/kiali-rhel8, openshift-service-mesh/kiali-ossmc-rhel8 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/kiali-rhel9, openshift-service-mesh/istio-cni-rhel9, openshift-service-mesh/istio-pilot-rhel9, openshift-service-mesh/kiali-ossmc-rhel9, openshift-service-mesh/istio-proxyv2-rhel9, openshift-service-mesh/istio-rhel9-operator, +5 more Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/console-rhel9, rhacm2/acm-grafana-rhel9, rhacm2/acm-flightctl-ui-rhel9, rhacm2/acm-flightctl-ocp-ui-rhel9, rhacm2/prometheus-alertmanager-rhel9 Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8, advanced-cluster-security/rhacs-roxctl-rhel8, advanced-cluster-security/rhacs-rhel8-operator, advanced-cluster-security/rhacs-collector-rhel8, advanced-cluster-security/rhacs-operator-bundle, advanced-cluster-security/rhacs-central-db-rhel8, +2 more Red Hat AMQ Broker 7 org.jolokia-jolokia-parent Red Hat Ansible Automation Platform 2 automation-gateway, automation-controller, automation-eda-controller, ansible-automation-platform-24/lightspeed-rhel8, ansible-automation-platform-25/lightspeed-rhel8 Red Hat build of Apache Camel - HawtIO 4 io.hawt-project Red Hat build of Apicurio Registry 2 io.apicurio-apicurio-registry Red Hat build of OptaPlanner 8 org.optaweb.vehiclerouting-optaweb-vehicle-routing Red Hat Data Grid 8 org.infinispan-infinispan-console Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9 Red Hat Discovery 1 discovery/discovery-ui-rhel9 Red Hat Discovery 2 discovery/discovery-ui-rhel9 Red Hat Edge Manager preview rhem/flightctl-ui-rhel9, rhem/flightctl-api-rhel9, rhem/flightctl-ui-ocp-rhel9, rhem/flightctl-worker-rhel9, rhacm2/acm-flightctl-ui-rhel9, rhem/flightctl-db-setup-rhel9, +6 more Red Hat Enterprise Linux 8 pcs, grafana, mozjs60, pcs-snmp, grafana-pcp, grafana-loki, +12 more Red Hat Enterprise Linux 9 gjs, pcs, polkit, grafana, pcs-snmp, grafana-pcp, +2 more Red Hat Enterprise Linux 10 grafana-pcp Red Hat Fuse 7 io.hawt-project, io.apicurio-apicurito, io.hawt-hawtio-online, io.syndesis-syndesis-parent Red Hat JBoss Enterprise Application Platform 7 io.hawt-project, org.jboss.hal-hal-parent Red Hat JBoss Enterprise Application Platform 8 io.hawt-project, org.jboss.hal-hal-parent, org.keycloak-keycloak-parent Red Hat JBoss Enterprise Application Platform Expansion Pack io.hawt-project, org.jboss.hal-hal-parent, org.keycloak-keycloak-parent Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel8, rhoai/odh-dashboard-rhel9, rhoai/odh-model-registry-rhel8, rhoai/odh-model-registry-rhel9, rhoai/odh-data-science-pipelines-argo-argoexec-rhel8, rhoai/odh-data-science-pipelines-argo-workflowcontroller-rhel8 Red Hat OpenShift Container Platform 4 openshift4/ose-console, openshift4/ose-console-rhel9, openshift4/ose-operator-sdk-rhel9, openshift4/ose-helm-rhel9-operator, openshift4/ose-monitoring-plugin-rhel8, openshift4/ose-monitoring-plugin-rhel9, +3 more Red Hat Openshift Data Foundation 4 odf4/mcg-core-rhel9, odf4/odf-console-rhel9, odf4/ocs-client-console-rhel9, odf4/odf-multicluster-console-rhel9 Red Hat OpenShift Dev Spaces devspaces/code-rhel9, devspaces/openvsx-rhel9, devspaces/traefik-rhel9, devspaces/dashboard-rhel9, devspaces/configbump-rhel9, devspaces/imagepuller-rhel9, +3 more Red Hat OpenShift GitOps openshift-gitops-1/dex-rhel8, openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9, openshift-gitops-1/gitops-rhel8, openshift-gitops-1/must-gather-rhel8, openshift-gitops-1/argocd-agent-rhel8, +5 more Red Hat Process Automation 7 org.uberfire-uberfire-parent, org.kie.workbench-kie-wb-common, org.kie-process-migration-service Red Hat Quay 3 quay/quay-rhel8
    not affected: vulnerable code not present

6 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
last yr.

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 8.8 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:A/U:Red
CNA 4.0 8.8 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:A/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:Red

Affected packages

ecosystem package affected fixed in
npm is-arrayish
>=0.3.3, <0.3.4
0.3.4

Affected products

  • Qix- node-is-arrayish

Classification

Weakness

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.