Answer in brief
CVE-2026-40181 records a Medium severity (CVSS 6.1) vulnerability in React Router's same-origin redirect with path starting // causes open redirect via protocol-relative URL reinterpretation. The current sources do not mark it as known exploited. The current feed maps remix-run/react-router (generic), remix-run/@remix-run/router (generic), react-router (npm), react-router (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-40181 records a Medium severity (CVSS 6.1) vulnerability in React Router's same-origin redirect with path starting // causes open redirect via protocol-relative URL reinterpretation. The current sources do not mark it as known exploited. The current feed maps remix-run/react-router (generic), remix-run/@remix-run/router (generic), react-router (npm), react-router (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps remix-run/react-router (generic), remix-run/@remix-run/router (generic), react-router (npm), react-router (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:shopify:react-router:*:*:*:*:*:node.js:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| remix-run/react-routergeneric | >= 7.0.0, < 7.14.1 || >= 6.7.0, < 6.30.4 | Not reported |
| remix-run/@remix-run/routergeneric | >= 1.3.0, < 1.23.3 | Not reported |
| react-routernpm | >=7.0.0,<7.14.1 | 7.14.1 |
| react-routernpm | >=6.7.0,<6.30.4 | 6.30.4 |
| @remix-run/routernpm | >=1.3.0,<1.23.3 | 1.23.3 |
Published upstream
Jun 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
React Router is a router for React. In versions 7.0.0 through 7.14.0 and 6.7.0 through 6.30.3, certain URLs passed to the redirect function can trigger an open redirect to an external domain due to path values starting with // being reinterpreted as protocol-relative URLs. The level of impact depends on the validation done by the application prior to returning the redirect. This does not impact applications using Declarative Mode (<BrowserRouter>). This is patched in versions 7.14.1 and 6.30.4.
Quoted source text, attributed separately from HOL analysis.
CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps remix-run/react-router (generic), remix-run/@remix-run/router (generic), react-router (npm), react-router (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:shopify:react-router:*:*:*:*:*:node.js:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| remix-run/react-routergeneric | >= 7.0.0, < 7.14.1 || >= 6.7.0, < 6.30.4 | Not reported |
| remix-run/@remix-run/routergeneric | >= 1.3.0, < 1.23.3 | Not reported |
| react-routernpm | >=7.0.0,<7.14.1 | 7.14.1 |
| react-routernpm | >=6.7.0,<6.30.4 | 6.30.4 |
| @remix-run/routernpm | >=1.3.0,<1.23.3 | 1.23.3 |
Published upstream
Jun 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
React Router is a router for React. In versions 7.0.0 through 7.14.0 and 6.7.0 through 6.30.3, certain URLs passed to the redirect function can trigger an open redirect to an external domain due to path values starting with // being reinterpreted as protocol-relative URLs. The level of impact depends on the validation done by the application prior to returning the redirect. This does not impact applications using Declarative Mode (<BrowserRouter>). This is patched in versions 7.14.1 and 6.30.4.
Quoted source text, attributed separately from HOL analysis.