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
CVE-2026-34077 describes a vulnerability in remix-run's react-router affecting versions from 7.7.0 up to but not including 7.14.0. When using the unstable React Server Components (RSC) APIs, the router's handling of redirects can allow client-side Cross-Site Scripting (XSS) if redirects originate from untrusted sources. Applications not using these unstable RSC APIs are not impacted. The vulnerability is classified under CWE-770 (Allocation of Resources Without Limits or Throttling). The CVSS v3.1 base score is 7.5, indicating high severity with network attack vector, low attack complexity, no privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, but high availability impact. The vulnerability is patched starting from version 7.13.2.
Potential Impact
The vulnerability allows potential client-side XSS attacks via redirects in the unstable React Server Components APIs, which can impact application availability. There is no direct confidentiality or integrity impact reported. 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 no official remediation level or patch links are provided, verify the upgrade path with the vendor or official repository. Applications not using the unstable React Server Components APIs are not impacted and require no action.
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
CVE-2026-34077 describes a vulnerability in remix-run's react-router affecting versions from 7.7.0 up to but not including 7.14.0. When using the unstable React Server Components (RSC) APIs, the router's handling of redirects can allow client-side Cross-Site Scripting (XSS) if redirects originate from untrusted sources. Applications not using these unstable RSC APIs are not impacted. The vulnerability is classified under CWE-770 (Allocation of Resources Without Limits or Throttling). The CVSS v3.1 base score is 7.5, indicating high severity with network attack vector, low attack complexity, no privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, but high availability impact. The vulnerability is patched starting from version 7.13.2.
Potential Impact
The vulnerability allows potential client-side XSS attacks via redirects in the unstable React Server Components APIs, which can impact application availability. There is no direct confidentiality or integrity impact reported. 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 no official remediation level or patch links are provided, verify the upgrade path with the vendor or official repository. Applications not using the unstable React Server Components APIs are not impacted and require no action.
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: 06/02/2026, 19:52:44 UTC
Last enriched: 06/10/2026, 11:14:17 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 79
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.