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Fencer Vulns
high 7.5

CVE-2025-43864 in the critical feed json

React Router allows a DoS via cache poisoning by forcing SPA mode

published 2025-04-24 18 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-11980 , GHSA-f46r-rw29-r322

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
20.5%
EPSS 20.5% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

React Router is a router for React. Starting in version 7.2.0 and prior to version 7.5.2, it is possible to force an application to switch to SPA mode by adding a header to the request. If the application uses SSR and is forced to switch to SPA, this causes an error that completely corrupts the page. If a cache system is in place, this allows the response containing the error to be cached, resulting in a cache poisoning that strongly impacts the availability of the application. This issue has been patched in version 7.5.2.

Patch / fix

  • npm react-router 7.5.2
  • shopify react-router 7.5.2

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-2025-43864 updated cvss 5.3

react-router: React Router allows a DoS via cache poisoning by forcing SPA mode

  • Red Hat Cryostat 3 io.cryostat-cryostat3 io.cryostat-cryostat3 Red Hat Cryostat 4 io.cryostat-cryostat Red Hat Network Observability Operator network-observability/network-observability-console-plugin-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed-tech-preview/lightspeed-console-plugin-rhel9 Red Hat OpenShift Serverless openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel8 Red Hat Ansible Automation Platform 2 automation-hub, python-galaxy-ng, automation-gateway, python3x-galaxy-ng, automation-controller, automation-eda-controller
    +15 more products
    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 Enterprise Linux 8 dotnet5.0-build-reference-packages Red Hat Fuse 7 io.syndesis-syndesis-parent Red Hat Integration Camel K 1 io.apicurio-apicurio-registry Red Hat JBoss Enterprise Application Platform 8 org.keycloak-keycloak-parent Red Hat JBoss Enterprise Application Platform Expansion Pack org.keycloak-keycloak-parent Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel8, rhoai/odh-model-registry-rhel8, rhoai/odh-ml-pipelines-driver-rhel8, rhoai/odh-ml-pipelines-launcher-rhel8, rhoai/odh-ml-pipelines-api-server-v2-rhel8, rhoai/odh-ml-pipelines-persistenceagent-v2-rhel8, +3 more Red Hat OpenShift Container Platform 4 openshift4/ose-monitoring-plugin-rhel8 Red Hat OpenShift distributed tracing 3 rhosdt/tempo-rhel8, rhosdt/tempo-query-rhel8, rhosdt/tempo-gateway-rhel8, rhosdt/tempo-rhel8-operator, rhosdt/tempo-operator-bundle, rhosdt/tempo-gateway-opa-rhel8, +1 more Red Hat Process Automation 7 org.uberfire-uberfire-parent Red Hat Single Sign-On 7 org.keycloak-keycloak-parent
    not affected: vulnerable code 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
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

20.47% chance of exploitation in the next 30 days, higher than 97% 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
>=7.2.0, <7.5.2
7.5.2

Affected products

  • remix-run react-router

Classification

Weakness
  • CWE-755 Improper Handling of Exceptional Conditions

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.

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