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Bump react-router to 7.18.0 [SECURITY] - #5438

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Bump react-router to 7.18.0 [SECURITY]#5438
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renovate/npm-react-router-vulnerability

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@renovate renovate Bot commented Aug 8, 2026

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This PR contains the following updates:

Package Change Age Confidence
react-router (source) 7.15.0 → 7.18.0 age confidence

React Router: Potential CSRF via PUT/PATCH/DELETE document requests

CVE-2026-53663 / GHSA-84g9-w2xq-vcv6

More information

Details

Certain CSRF checks in React Router v7 Framework Mode were insufficient and run on POST requests, but were bypassed on PUT/PATCH/DELETE requests. This is a low severity vulnerability because modern browser protections (CORS preflight, SameSite cookies) already block the cross-origin attack vectors that this missing CSRF check would otherwise gate.

[!NOTE]
This does not impact your React Router application if you are using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>).

Severity

  • CVSS Score: 3.1 / 10 (Low)
  • Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

React Router: RSCErrorHandler Missing Protocol Validation (XSS)

CVE-2026-53667 / GHSA-h8fp-f39c-q6mh

More information

Details

This is a follow up to GHSA-8646-j5j9-6r62. React Router was alerted of a code path in the (unstable) RSC error handling path in which redirects from untrusted sources could still result in an XSS vector via attacker-supplied redirect targets

[!NOTE]
This only affects your application if you are using the unstable RSC APIs

Severity

  • CVSS Score: 6.9 / 10 (Medium)
  • Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR Hydration

CVE-2026-53666 / GHSA-337j-9hxr-rhxg

More information

Details

If application code allows attacker supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for attacker to trigger unexpected constructor execution on the client which would trigger outbound network traffic. This is only possible with very specific (and unlikely) application layer code.

[!NOTE]
This does not impact your application if you are using Declarative Mode. This only impacts Framework Mode and Data Mode applications doing manual SSR/hydration

Severity

  • CVSS Score: 6.1 / 10 (Medium)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

React Router: Open redirect via backslash in and useNavigate (CVE-2025-68470 bypass)

CVE-2026-53669 / GHSA-wrjc-x8rr-h8h6

More information

Details

This is a follow up to CVE-2025-68470. React Router was alerted to certain scenarios in which the fix there was incomplete so there still existed some scenarios where attacker supplied paths passed to navigation mechanisms could result in unexpected external navigations.

Severity

  • CVSS Score: 5.1 / 10 (Medium)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

React Router: Unauthenticated Denial of Service via Inefficient Route Matching

CVE-2026-55685 / GHSA-chx6-hx7r-mcp5

More information

Details

This is a follow up to GHSA-8x6r-g9mw-2r78 that covers additional reported scenarios in which the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response times.

[!NOTE]
This only impacts Framework Mode applications. This does not impact your application if you are using Declarative or Data Mode.

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Release Notes

remix-run/react-router (react-router)

v7.18.0

Compare Source

Patch Changes
  • Fix server handler prerender responses when using ssr: false and future.v8_trailingSlashAwareDataRequests: true. Avoids false positive "SPA Mode" detection when serving prerendered paths (#​15173)
  • Use the ServerRouter nonce for nonce-aware SSR components when they don't provide their own value so strict CSP pages can load them. (#​15170)
  • Use turbo-stream to serialize and deserialize Framework Mode hydration errors (#​15175)
  • Precompute route branch matchers to avoid recompiling route path regexes during matching (#​15186)
  • Use the constructed request URL host when validating action request origins. (#​15185)
  • Remove the un-documented custom error serialization logic from Data Mode SSR built-in hydration flows (#​15175)
  • Validate protocols in RSC render redirects (#​15177)
  • Consolidate url normalization logic and better handle mixed slashes (#​15176)

v7.17.0

Compare Source

Minor Changes

  • Ship a subset of the official documentation inside the react-router package (#​15121)

    • Markdown docs are now available in node_modules/react-router/docs, letting AI coding agents and the React Router agent skills read official docs locally
    • Excludes auto-generated API docs (api/), community/ content, and tutorials (tutorials/)

v7.16.0

Compare Source

Minor Changes
  • Stabilize future.unstable_trailingSlashAwareDataRequests as future.v8_trailingSlashAwareDataRequests (#​15098)
Patch Changes

  • Disable manifest path when lazy route dicovery is disabled (#​15068)

  • Fix browser URL creation to use the configured history window instead of the global window. (#​15066)

    • Pass the history/router window through to createBrowserURLImpl so custom window contexts keep the correct URL origin.

  • Fix useNavigation() return type to preserve discriminated union across navigation states (#​15095)

  • Widen MetaDescriptor script:ld+json type from LdJsonObject to LdJsonObject | LdJsonObject[] to permit multiple JSON-LD schemas in a single <script type="application/ld+json"> tag emitted by <Meta /> (#​15082)

v7.15.1

Compare Source

Patch Changes
  • Update router to operate on fetcher Maps in an immutable manner to avoid delayed React renders from potentially reading an updated but not yet committed Map. This could result in brief flickers in some fetcher-driven optimistic UI scenarios. (#​15028)
  • Fix serverLoader() returning stale SSR data when a client navigation aborts pending hydration before the hydration clientLoader resolves (#​15022)
  • Fix RouterProvider onError callback not being called for synchronous initial loader errors in SPA mode (#​15039) (#​14942)
  • Memoize useFetchers to return a stable identity and only change if fetchers changed (#​15028)
  • Internal refactor to consolidate mutation request detection through shared utility (#​15033)
Unstable Changes

⚠️ Unstable features are not recommended for production use

  • Add a new unstable_useRouterState() hook that consolidates access to active and pending router states (RFC: #​12358) (#​15017)

    • Data/Framework/RSC only — throws when used without a data router

    • This should allow you to consolidate usages of the following hooks which will likely be deprecated and removed in a future major version

      • useLocation
      • useSearchParams
      • useParams
      • useMatches
      • useNavigationType
      • useNavigation
      let { active, pending } = unstable_useRouterState();

// Active is always populated with the current location
active.location; // replaces `useLocation()`
active.searchParams; // replaces `useSearchParams()[0]`
active.params; // replaces `useParams()`
active.matches; // replaces `useMatches()`
active.type; // replaces `useNavigationType()`

// Pending is only populated during a navigation
pending.location; // replaces `useNavigation().location`
pending.searchParams; // equivalent to `new URLSearchParams(useNavigation().search)`
pending.params; // Not directly accessible today
pending.matches; // Not directly accessible today
pending.type; // Not directly accessible today
pending.state; // replaces `useNavigation().state`
pending.formMethod; // replaces useNavigation().formMethod
pending.formAction; // replaces useNavigation().formAction
pending.formEncType; // replaces useNavigation().formEncType
pending.formData; // replaces useNavigation().formData
pending.json; // replaces useNavigation().json
pending.text; // replaces useNavigation().text

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This PR was generated by Mend Renovate. View the repository job log.

@renovate renovate Bot added dependencies Update of dependencies. security Pull requests that address a security vulnerability. labels Aug 8, 2026
@renovate renovate Bot added dependencies Update of dependencies. security Pull requests that address a security vulnerability. labels Aug 8, 2026
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⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

  • any of the package files in this branch needs updating, or
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  • you click the rebase/retry checkbox if found above, or
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The artifact failure details are included below:

File name: undefined
Post-upgrade command 'pnpm exec prettier --write pnpm-workspace.yaml package.json' has not been added to the allowed list in allowedCommands

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commit: b3d3df0

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Bundle size

Bundle Parsed size Gzip size
@base-ui/react 0B(0.00%) 0B(0.00%)

Details of bundle changes

Performance

Total duration: 1,046.14 ms -6.12 ms(-0.6%) | Renders: 76 (+0) | Paint: 1,617.94 ms -51.05 ms(-3.1%)

Test Duration Renders
Tooltip mount (300 contained roots) 56.27 ms 🔺+10.26 ms(+22.3%) 1 (+0)

14 tests within noise — details

Metric alarms

Test Metric Change
Tooltip mount (300 contained roots) bench:paint 🔺 +15.37 ms

Check out the code infra dashboard for more information about this PR.

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