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CVE-2026-34077— React Router vulnerable to Denial of Service via reflected user input in single-fetch

Quick assessment

Affected
remix-run react-router
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

react-router是Remix开源的一个 React 的声明式路由。 react-router 7.7.0版本至7.13.1版本存在安全漏洞，该漏洞源于使用不稳定的RSC API时重定向处理不当，可能导致客户端跨站脚本攻击。

CVSS 7.5 · High EPSS 0.29% · P22

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 2

VendorProduct Version RangeStatus
remix-run react-router >= 7.0.0, < 7.14.0 affected
remix-run turbo-stream < 3.0.0 affected
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I. Basic Information for CVE-2026-34077

Vulnerability Information
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Vulnerability Title
React Router vulnerable to Denial of Service via reflected user input in single-fetch
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
react-router 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
react-router是Remix开源的一个 React 的声明式路由。 react-router 7.7.0版本至7.13.1版本存在安全漏洞，该漏洞源于使用不稳定的RSC API时重定向处理不当，可能导致客户端跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
remix-run react-router >= 7.0.0, < 7.14.0 -
remix-run turbo-stream < 3.0.0 -

II. Public POCs for CVE-2026-34077

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7978 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-34077

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Vendor Advisories for CVE-2026-34077 (1)

Same Patch Batch · remix-run · 2026-06-02 · 6 CVEs total

CVE-2026-42211 8.1 HIGH React Router's vendored turbo-stream v2 allows arbitrary constructor invocation via TYPE_E
CVE-2026-33245 8.0 HIGH React Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect
CVE-2026-42342 7.5 HIGH React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
CVE-2026-40181 6.6 MEDIUM React Router's same-origin redirect with path starting // causes open redirect via protoco
CVE-2026-33244 5.4 MEDIUM React Router has stored XSS via unescaped Location header in prerendered redirect HTML

IV. Related Vulnerabilities

Same product: react-router
Same vendor: remix-run
Same weakness: CWE-770

V. Comments for CVE-2026-34077

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