React Router allows a DoS via cache poisoning by forcing SPA mode
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| remix-run | react-router | 7.2.0 to before 7.5.2 | 7.5.2 | Patch available | CNA |
| — | react-router (npm) | 7.2.0 to before 7.5.2 | 7.5.2 | Patch available | GHSA-f46r-rw29-r322 |
- react-router Vendorremix-run Affected 7.2.0 to before 7.5.2 Fixed in 7.5.2 Patch available CNA
- react-router (npm) Vendor— Affected 7.2.0 to before 7.5.2 Fixed in 7.5.2 Patch available GHSA-f46r-rw29-r322
Remediation
- Fix · CNA react-router (remix-run) Fixed in 7.5.2
- Fix · GHSA-f46r-rw29-r322 react-router (npm) Fixed in 7.5.2 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 21 products
- Cryostat 3
- Cryostat 4
- Network Observability Operator
- OpenShift Lightspeed
- OpenShift Serverless
- Red Hat Ansible Automation Platform 2
- Red Hat Data Grid 8
- Red Hat Developer Hub 1
- Red Hat Enterprise Linux 8
- Red Hat Fuse 7
- Red Hat Integration Camel K 1
- Red Hat JBoss Enterprise Application Platform 8
- Red Hat JBoss Enterprise Application Platform Expansion Pack
- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift distributed tracing 3
- Red Hat Process Automation 7
- Red Hat Single Sign-On 7
- Red Hat build of Apache Camel - HawtIO 4
- Red Hat build of Apicurio Registry 2
- Red Hat build of OptaPlanner 8
Timeline
- 2026-10-02 Threatist record created from CVE-2025-43864
- 2026-10-03 Alias added: GHSA-f46r-rw29-r322
- 2026-10-27 Affected versions changed · Red Hat
References
Other 4
- https://github.com/remix-run/react-router/security/advisories/GHSA-f46r-rw29-r322
- https://github.com/remix-run/react-router/commit/c84302972a152d851cf5dd859ff332b354b70111
- https://github.com/remix-run/react-router/blob/e6c53a0130559b4a9bd47f9cf76ea5b08a69868a/packages/react-router/lib/server-runtime/server.ts#L407
- https://github.com/remix-run/react-router
More remix-run vulnerabilities
- TI-2025-28449 React Router allows pre-render data spoofing on React-Router framework mode CVSS 3.1HIGH 8.2
- TI-2025-38117 React Router has Path Traversal in File Session Storage CVSS 3.1CRITICAL 9.1
- TI-2026-40200 React Router: Unauthenticated Denial of Service via Inefficient Route Matching CVSS 4.0HIGH 8.7
- TI-2025-33550 Job Iteration API is vulnerable to OS Command Injection attack through its CsvEnumerator class CVSS 4.0HIGH 8.1
- TI-2026-26385 Ruby LSP has arbitrary code execution through branch setting CVSS 4.0HIGH 7.1
- TI-2026-30645 React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint CVSS 3.1HIGH 7.5
Sources
- CVE-2025-43864 · CVE Program
- CVE-2025-43864 · NVD
- FIRST EPSS
- GHSA-f46r-rw29-r322 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-43864 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences