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No exploitation reportedFix available

CVE-2026-42211

No exploitation reported by the sources we read.

  • Published2026-06-02
  • Fixed in7.14.2
  • WeaknessCWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

React Router is a router for React. In versions 7.0.0 through 7.14.1, when using Framework Mode, a combination of steps could potentially allow unauthorized remote code execution (RCE) through external requests. This attack requires the application code to have an existing prototype pollution vulnerability, which can then be leveraged in a 2-step attack where the second step triggers unauthorized RCE on the remote server. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in version 7.14.2.

Timeline

dates in UTC
  1. 2026-06-0220:16CVE publishedNVD

Versions per branch

NVD · OSV
Shopify react-router
BranchAffectedFixed in
7.x≥ 7.0.0, < 7.14.27.14.2

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • remix-run react-router
    Affected
    • = >= 7.0.0, < 7.14.2no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-06-02

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • @rootio/react-routerRoot:npmall versions · fixed in 7.12.0-root.io.1
  • @rootio/react-routerRoot:npmall versions · fixed in 7.12.0-root.io.2
  • @rootio/react-routerRoot:npmall versions · fixed in 7.12.0-root.io.3
  • airflow-2Chainguardall versions · no fixed version listedand 1 other package
  • golang-github-prometheus-prometheusSUSE:Multi Linux Manager Tools SLE-15all versions · fixed in 3.13.2-150002.3.19.1
  • golang-github-prometheus-prometheusSUSE:Linux Enterprise Module for Package Hub 15 SP7all versions · fixed in 3.13.2-150100.4.40.2
  • grafanaSUSE:Multi Linux Manager Tools SLE-15all versions · fixed in 12.4.10-150002.4.27.1
  • mgr-pushSUSE:Multi Linux Manager Tools SLE-15all versions · fixed in 5.2.5-150002.3.12.1

15 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-42211 Red Hat Product Security39 products fixed · 14 known affected

    react-router: React Router: Remote Code Execution via prototype pollution in Framework Mode

    openshift-pipelines/pipelines-console-plugin-rhel9 as a component of OpenShift Pipelines · ansible-on-clouds/aoc-azure-aap-installer-rhel9 as a component of Red Hat Ansible Automation Platform 2 · automation-controller.src as a component of Red Hat Ansible Automation Platform 2 · +11 more

  • RHSA-2026:84734 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI

  • RHSA-2026:68277 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: Red Hat build of Keycloak 26.6.7 Images Security Update

  • RHSA-2026:68278 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat build of Keycloak 26.6.7 Security Update

  • RHSA-2026:60520 Red Hat Product Security20 products fixed

    Red Hat Security Advisory: RHOAI 3.4.4 - Red Hat OpenShift AI

  • RHSA-2026:42085 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: RHTAS 1.3.6 - Red Hat Trusted Artifact Signer Release

2 more advisories

Full record on NVD

Fix

  1. Update Shopify react-router to 7.14.2
  2. Vendor fix Red Hat Product Security RHSA-2026:84734 · 4 productsFor Red Hat OpenShift AI 3.4.5 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  3. Vendor fix Red Hat Product Security RHSA-2026:68277 · 9 productsBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.
  4. Vendor fix Red Hat Product Security RHSA-2026:60520 · 20 productsFor Red Hat OpenShift AI 3.4.4 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  5. Vendor fix Red Hat Product Security RHSA-2026:42085 · 1 productRed Hat Trusted Artifact Signer simplifies cryptographic signing and verifying of software artifacts such as container images, binaries and source code changes. It is a self-managed on-premise deployment of the Sigstore project available at https://sigstore.dev Platform Engineers, Software Develop…
  6. Vendor fix Red Hat Product Security RHSA-2026:41951 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  7. Vendor fix Red Hat Product Security RHSA-2026:29770 · 3 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-06-03
  • CNACVSS 3.18.1known since 2026-10-23
  • CNAweakness (CWE)CWE-502known since 2026-10-23
  • FIRST EPSSEPSS score0.4 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-06-03

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-06-02
Last Modified
2026-07-21
NVD status
Analyzed
GitHub Advisory
GHSA-49rj-9fvp-4h2h

Frequently asked questions

What is CVE-2026-42211?

React Router is a router for React. In versions 7.0.0 through 7.14.1, when using Framework Mode, a combination of steps could potentially allow unauthorized remote code execution (RCE) through external requests. This attack requires the application code to have an existing prototype pollution vulnerability, which can then be leveraged in a 2-step attack where the second step triggers unauthorized RCE on the remote server. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in version 7.14.2.

Is CVE-2026-42211 actively exploited?

Active exploitation of CVE-2026-42211 has not been confirmed. Its EPSS score was 0.4% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-42211?

CVE-2026-42211 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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