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Fencer Vulns
high 7.5

CVE-2026-42342 json

React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint

published 2026-06-02 5 mo ago modified 2026-09-10 1 mo ago also GHSA-8x6r-g9mw-2r78 , EUVD-2026-34000

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

React Router is a router for React. In versions 7.0.0 through 7.14.x of react-router and versions 2.10.0 through 2.17.4 of @remix-run/server-runtime, certain crafted requests can consume disproportionate server resources via unbounded path expansion in the __manifest endpoint, resulting in response time degradation and/or service unavailability for end users. This affects React Router Framework Mode applications as well as Remix applications. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in react-router version 7.15.0 and @remix-run/server-runtime version 2.17.5.

Patch / fix

  • npm react-router 7.15.0
  • npm @remix-run/server-runtime 2.17.5
  • shopify react-router 7.15.0
  • shopify remix-run/server-runtime 2.17.5
  • golang-github-prometheus-prometheus SLE Module for Package Hub 15 SP7 3.13.2-150100.4.40.2
  • grafana Multi Linux Manager Tools SLE-15 12.4.10-150002.4.27.1
  • mgr-push Multi Linux Manager Tools SLE-15 5.2.5-150002.3.12.1
  • spacecmd Multi Linux Manager Tools SLE-15 5.2.10-150002.3.15.1
  • uyuni-tools Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 5.2.17-150002.3.20.1
  • venv-salt-minion Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 3006.0-150002.5.22.1
  • spacewalk-client-tools Multi Linux Manager Tools SLE-15 5.2.7-150002.3.12.1
  • golang-github-prometheus-prometheus Multi Linux Manager Tools SLE-15 3.13.2-150002.3.19.1

suse advisories SUSE-SU-2026:4606-1SUSE-SU-2026:4585-1

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-2026-42342 updated cvss 6.5

react-router: @remix-run/server-runtime: React Router / Remix: Denial of Service via unbounded path expansion in __manifest endpoint

  • Red Hat Exploit Intelligence exploit-intelligence-tech-preview/agent-client-rhel9
    affected: workaround, no fix available
  • Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-ui-rhel8
    affected: workaround, no fix available
  • Red Hat Migration Toolkit for Virtualization mtv-candidate/mtv-console-plugin-rhel9, migration-toolkit-virtualization/mtv-console-plugin-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/console-mce-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-rhel9-operator, workload-availability/node-healthcheck-operator-bundle, workload-availability/node-healthcheck-must-gather-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift Pipelines openshift-pipelines/pipelines-hub-ui-rhel8, openshift-pipelines/pipelines-hub-ui-rhel9, openshift-pipelines/pipelines-console-plugin-rhel8, openshift-pipelines/pipelines-console-plugin-rhel9, openshift-pipelines/pipelines-console-plugin-pf5-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat OpenShift Service Mesh 2 openshift-service-mesh/kiali-rhel8
    affected: workaround, no fix planned “Will not fix”
show 21 more
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/console-rhel9, redhat-user-workloads/crt-redhat-acm-tenant/console-acm-213, redhat-user-workloads/crt-redhat-acm-tenant/release-acm-211/console-acm-211, redhat-user-workloads/crt-redhat-acm-tenant/release-acm-212/console-acm-212
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Ansible Automation Platform 2 automation-hub, python-galaxy-ng, automation-gateway, python3x-galaxy-ng, python3.11-galaxy-ng, python3.12-galaxy-ng, +6 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Apache Camel - HawtIO 4 react-router Red Hat build of Apicurio Registry 2 react-router Red Hat build of Apicurio Registry 3 apicurio/apicurio-registry-ui-rhel8, apicurio/apicurio-registry-ui-rhel9 Red Hat Build of Keycloak react-router
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Build of Podman Desktop rh-podman-desktop.git Red Hat Ceph Storage 5 rhceph/rhceph-5-dashboard-rhel8 Red Hat Ceph Storage 9 rhceph/alloy-rhel10
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 Red Hat Edge Manager 1 rhem/flightctl-ui-rhel9, rhem/flightctl-ui-rhel10, rhem/flightctl-ui-ocp-rhel9, rhem/flightctl-ui-ocp-rhel10 Red Hat Enterprise Linux 8 pcs, grafana, pcs-snmp, grafana-pcp, thunderbird, grafana-loki, +14 more Red Hat Enterprise Linux 9 ipa, ipa-client, ipa-common, ipa-server, ipa-selinux, ipa-client-epn, +13 more Red Hat Enterprise Linux 10 ipa
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Fuse 7 react-router
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-mod-arch-eval-hub-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift Container Platform 4 openshift4/ose-console, openshift4/ose-monitoring-plugin-rhel8
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift Container Platform 5 openshift5/ose-console-rhel9, openshift5/ose-agent-installer-ui-rhel9 Red Hat Openshift Data Foundation 4 rhceph-dev/odf4-odf-console-rhel9 Red Hat OpenShift distributed tracing 3 rhosdt/tempo-jaeger-query-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9, openshift-gitops-1/console-plugin-rhel8
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Process Automation 7 react-router
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Satellite 6 nodejs-react-router, nodejs-react-router-dom, satellite/iop-advisor-frontend-rhel9, satellite/iop-vulnerability-frontend-rhel9, satellite/iop-host-inventory-frontend-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Single Sign-On 7 react-router
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Trusted Profile Analyzer rhtpa/rhtpa-trustification-service-rhel9
    affected: workaround, no fix available
  • Red Hat Self-service automation portal 2 ansible-automation-platform/automation-portal
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Data Grid 8.6.2
    fixed: vendor fix RHSA-2026:41951
  • Red Hat Migration Toolkit for Applications 8.1 mta/mta-ui-rhel9 1785169013
    fixed: vendor fix RHSA-2026:50300
  • Red Hat OpenShift AI 3.4 rhoai/odh-dashboard-rhel9 1787347991, rhoai/odh-mod-arch-maas-rhel9 1787251250, rhoai/odh-mod-arch-gen-ai-rhel9 1786611759, rhoai/odh-mod-arch-mlflow-rhel9 1786612219, rhoai/odh-mod-arch-model-registry-rhel9 1787250617
    fixed: vendor fix RHSA-2026:60520
  • Red Hat Openshift Data Foundation 4.18 odf4/cephcsi-rhel9 1786705347, odf4/odf-cli-rhel9 1786705938, odf4/mcg-core-rhel9 1786705558, odf4/odf-console-rhel9 1786706577, odf4/mcg-rhel9-operator 1786705646, odf4/ocs-rhel9-operator 1786705802, +13 more
    fixed: vendor fix RHSA-2026:56431

3 more fixed, 23 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
5 mo ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm react-router
>=7.0.0, <7.15.0
7.15.0
npm @remix-run/server-runtime
>=2.10.0, <2.17.5
2.17.5

Affected products

  • remix-run react-router
  • remix-run @remix-run/server-runtime

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

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.