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Fencer Vulns
high 7.5

CVE-2026-34077 json

React Router vulnerable to Denial of Service via reflected user input in single-fetch

published 2026-06-02 5 mo ago modified 2026-07-22 3 mo ago also GHSA-rxv8-25v2-qmq8 , EUVD-2026-33994

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 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.

Patch / fix

  • npm react-router 7.14.0
  • npm turbo-stream 3.0.0
  • shopify react-router 7.14.0
  • turbo-stream turbo_stream 3.0.0
  • agama-web-ui openSUSE Tumbleweed 22+143.ee15dea20-46.1

opensuse advisories openSUSE-SU-2026:11128-1

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-2026-34077 updated cvss 6.5

react-router: React Router: Denial of Service via client-side Cross-Site Scripting in RSC redirect handling

  • Red Hat Exploit Intelligence exploit-intelligence-tech-preview/agent-client-rhel9 Red Hat Migration Toolkit for Applications 8 mta/mta-ui-rhel8, mta/mta-ui-rhel9 Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-ui-rhel8 Red Hat Migration Toolkit for Virtualization mtv-candidate/mtv-console-plugin-rhel9, migration-toolkit-virtualization/mtv-console-plugin-rhel9 Red Hat Network Observability Operator network-observability/network-observability-console-plugin-rhel9, network-observability/network-observability-console-plugin-compat-rhel9 Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-rhel9-operator, workload-availability/node-healthcheck-operator-bundle, workload-availability/node-healthcheck-must-gather-rhel9
    +5 more products
    Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-console-plugin-rhel9, openshift-lightspeed/lightspeed-console-plugin-419-rhel9, openshift-lightspeed/lightspeed-console-plugin-pf5-rhel9 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 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/kiali-ossmc-rhel9, openshift-service-mesh/kiali-rhel9-operator, openshift-service-mesh/kiali-operator-bundle Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8
    affected: no fix available “Fix deferred”
  • Red Hat build of Apache Camel - HawtIO 4 react-router
    affected: no fix available
  • 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: no fix planned “Out of support scope”
  • Red Hat Ceph Storage 5 rhceph/rhceph-5-dashboard-rhel8 Red Hat Ceph Storage 9 rhceph/alloy-rhel10 Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Fuse 7 react-router Red Hat JBoss Enterprise Application Platform Expansion Pack react-router
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 4 openshift4/ose-console, openshift4/ose-console-rhel9, openshift4/ose-monitoring-plugin-rhel8, openshift4/ose-monitoring-plugin-rhel9, openshift4/ose-agent-installer-ui-rhel9, openshift4/ose-prometheus-alertmanager-rhel9, +1 more Red Hat OpenShift Container Platform 5 openshift5/ose-console-rhel9, openshift5/ose-monitoring-plugin-rhel9, openshift5/ose-agent-installer-ui-rhel9 Red Hat Openshift Data Foundation 4 odf4/odf-console-rhel9, odf4/ocs-client-console-rhel9, rhceph-dev/odf4-odf-console-rhel9, odf4/odf-multicluster-console-rhel9, rhceph-dev/odf4-ocs-client-console-rhel9, rhceph-dev/odf4-odf-multicluster-console-rhel9 Red Hat OpenShift Dev Spaces devspaces/openvsx-rhel9, devspaces/dashboard-rhel9 Red Hat OpenShift distributed tracing 3 rhosdt/tempo-jaeger-query-rhel9 Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9, openshift-gitops-1/console-plugin-rhel8, openshift-gitops-1/console-plugin-rhel9
    +1 more products
    Red Hat OpenShift Virtualization 4 container-native-virtualization/kubevirt-console-plugin, container-native-virtualization/kubevirt-console-plugin-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Process Automation 7 react-router
    affected: no fix planned “Out of support scope”
  • Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9
    affected: no fix available “Fix deferred”
show 3 more
  • Red Hat Single Sign-On 7 react-router
    affected: no fix planned “Out of support scope”
  • Red Hat Trusted Artifact Signer rhtas/rhtas-console-ui-rhel9 Red Hat Trusted Profile Analyzer rhtpa/rhtpa-trustification-service-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9 Red Hat Multicluster Engine for Kubernetes multicluster-engine/console-mce-rhel9 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 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 Red Hat Build of Podman Desktop rh-podman-desktop.git Red Hat Discovery 2 discovery/discovery-ui-rhel9
    +2 more products
    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
    under investigation

5 more under investigation, 1 more fixed, 5 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

0.29% 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, <7.14.0
7.14.0
npm turbo-stream
<3.0.0
3.0.0

Affected products

  • remix-run react-router
  • remix-run turbo-stream

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

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.