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No exploitation reportedFix available

CVE-2026-55685

No exploitation reported by the sources we read.

  • Published2026-07-27
  • Fixed in7.18.0
  • WeaknessCWE-400 · CWE-407

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 7.17.0, the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response times. This issue is a follow up to CVE-2026-42342, and does not does not impact React Router applications using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>). This issue has been fixed in version 7.18.0.

Timeline

dates in UTC
  1. 2026-07-2722:17CVE publishedNVD

Versions per branch

NVD · OSV
Shopify react-router
BranchAffectedFixed in
7.x≥ 7.0.0, < 7.18.07.18.0

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, < 7.18.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-07-27

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 7.15.1-root.io.1
  • @rootio/react-routerRoot:npmall versions · fixed in 7.12.0-root.io.3
  • @rootio/react-routerRoot:npmall versions · fixed in 7.15.1-root.io.3
  • @rootio/react-routerRoot:npmall versions · fixed in 7.18.0-root.io.1
  • airflow-2Chainguardall versions · no fixed version listedand 1 other package
  • react-routerTuxCare:npmfrom 7.5.1-tuxcare.0 · fixed in 7.5.1-tuxcare.7and 11 other packages
  • react-routerTuxCare:npmfrom 7.15.0-tuxcare.0 · fixed in 7.15.0-tuxcare.2and 1 other package
  • react-routerRoot:npmall versions · fixed in 7.15.1-aikido.1

7 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-55685 Red Hat Product Security40 products fixed · 59 known affected

    react-router: @remix-run/server-runtime: React Router: Denial of Service via unauthenticated manifest endpoint requests

    exploit-intelligence-tech-preview/agent-client-rhel9 as a component of Exploit Intelligence · network-observability/network-observability-console-plugin-rhel9 as a component of Network Observability Operator · openshift-lightspeed/lightspeed-agentic-console-rhel9 as a component of OpenShift Lightspeed · +56 more

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

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

  • RHSA-2026:65126 Red Hat Product Security8 products fixed

    Red Hat Security Advisory: RHOAI 2.25.11 - Red Hat OpenShift AI

  • RHSA-2026:60520 Red Hat Product Security28 products fixed

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

Full record on NVD

Fix

  1. Update Shopify react-router to 7.18.0
  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-2026:65126 · 8 productsFor Red Hat OpenShift AI 2.25.11 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/
  4. Vendor fix Red Hat Product Security RHSA-2026:60520 · 28 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. Workaround from the vendor Red Hat Product Security RHSA-2026:84734 · 321 productsUpgrade to react-router/@remix-run/server-runtime 7.18.0 or later once the fix is packaged in the affected Red Hat product. Where upgrading isn't immediately possible, rate-limiting or restricting access to the manifest endpoint at a reverse proxy or ingress layer can reduce exposure. Products that…
  6. No fix available, says the vendor Red Hat Product Security CVE-2026-55685 · 58 productsFix deferred
  7. No fix available, says the vendor Red Hat Product Security CVE-2026-55685 · 1 productAffected

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

  • CISA-ADPSSVC decisionnone2026-07-28
  • CNACVSS 4.08.7known since 2026-10-24
  • NVDCVSS 3.17.5read 2026-10-24
  • CNAweakness (CWE)CWE-400, CWE-407known since 2026-10-24
  • FIRST EPSSEPSS score0.7 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-07-24

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-07-27
Last Modified
2026-10-24
NVD status
Analyzed
GitHub Advisory
GHSA-chx6-hx7r-mcp5

Frequently asked questions

What is CVE-2026-55685?

React Router is a router for React. In versions 7.0.0 through 7.17.0, the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response times. This issue is a follow up to CVE-2026-42342, and does not does not impact React Router applications using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>). This issue has been fixed in version 7.18.0.

Is CVE-2026-55685 actively exploited?

Active exploitation of CVE-2026-55685 has not been confirmed. Its EPSS score was 0.7% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-55685?

CVE-2026-55685 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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