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Fencer Intel
high 8.2

CVE-2025-43865 json

React Router allows pre-render data spoofing on React-Router framework mode

published last yr. modified 4mo ago also EUVD-2025-11979 , GHSA-cpj6-fhp6-mr6j

cvss
8.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

React Router is a router for React. In versions on the 7.0 branch prior to version 7.5.2, it's possible to modify pre-rendered data by adding a header to the request. This allows to completely spoof its contents and modify all the values ​​of the data object passed to the HTML. This issue has been patched in version 7.5.2.

Patch / fix

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

Is CVE-2025-43865 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2025-43865 updated cvss 6.5

react-router: React Router allows pre-render data spoofing on React-Router framework mode

  • Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel8
    affected: workaround, no fix available
  • Red Hat OpenShift AI 2.23 rhoai v2.23.0-1754417509
    fixed: vendor fix RHSA-2025:13904
  • 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-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, rhoai/odh-ml-pipelines-scheduledworkflow-v2-rhel8, +2 more Red Hat OpenShift AI 2.23 rhoai 0.0-1753800247, rhoai v2.23.0-1751592947, rhoai v2.23.0-1752629802, rhoai v2.23.0-1752716177, rhoai v2.23.0-1753194205, rhoai v2.23.0-1754375358, +18 more 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
last yr.

Exploit prediction

0.82% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
GitHub 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Affected packages

ecosystem package affected fixed in
npm react-router
>=7.0.0-pre.0, <7.5.2
7.5.2

Affected products

  • remix-run react-router

Classification

Weakness
  • CWE-345 Insufficient Verification of Data Authenticity

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.

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