CVE-2026-34077: CWE-770: Allocation of Resources Without Limits or Throttling in remix-run react-router
React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.
AI Analysis
Technical Summary
React Router versions 7.7.0 through 7.13.1 contain a vulnerability classified under CWE-770 (Allocation of Resources Without Limits or Throttling) that manifests as a potential client-side XSS in the handling of redirects within the unstable React Server Components APIs. This vulnerability arises when redirects are processed from untrusted sources, potentially allowing malicious scripts to execute in the client context. The vulnerability does not affect applications that do not use the unstable RSC APIs. The issue is addressed in React Router version 7.13.2.
Potential Impact
The vulnerability can lead to client-side Cross-Site Scripting (XSS) attacks when using the unstable React Server Components APIs with redirects from untrusted sources. This could allow attackers to execute arbitrary scripts in the context of the affected application, potentially impacting availability (as indicated by the CVSS vector) but without confirmed confidentiality or integrity impacts. Applications not using the unstable RSC APIs are not affected.
Mitigation Recommendations
Upgrade React Router to version 7.13.2 or later, where this vulnerability is patched. Since the vulnerability only affects applications using the unstable React Server Components APIs, applications not using these APIs are not impacted and require no action. Patch status is confirmed by the vendor advisory indicating the fix in version 7.13.2.
CVE-2026-34077: CWE-770: Allocation of Resources Without Limits or Throttling in remix-run react-router
Description
React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.
CVSS v3.1
Score 7.5high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
React Router versions 7.7.0 through 7.13.1 contain a vulnerability classified under CWE-770 (Allocation of Resources Without Limits or Throttling) that manifests as a potential client-side XSS in the handling of redirects within the unstable React Server Components APIs. This vulnerability arises when redirects are processed from untrusted sources, potentially allowing malicious scripts to execute in the client context. The vulnerability does not affect applications that do not use the unstable RSC APIs. The issue is addressed in React Router version 7.13.2.
Potential Impact
The vulnerability can lead to client-side Cross-Site Scripting (XSS) attacks when using the unstable React Server Components APIs with redirects from untrusted sources. This could allow attackers to execute arbitrary scripts in the context of the affected application, potentially impacting availability (as indicated by the CVSS vector) but without confirmed confidentiality or integrity impacts. Applications not using the unstable RSC APIs are not affected.
Mitigation Recommendations
Upgrade React Router to version 7.13.2 or later, where this vulnerability is patched. Since the vulnerability only affects applications using the unstable React Server Components APIs, applications not using these APIs are not impacted and require no action. Patch status is confirmed by the vendor advisory indicating the fix in version 7.13.2.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-25T16:21:40.868Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1f348ce29bf47b50fa1fe8
Added to database: 6/2/2026, 7:52:44 PM
Last enriched: 6/2/2026, 8:03:58 PM
Last updated: 6/3/2026, 5:06:34 AM
Views: 8
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.