{"schema_version":"1.9.0","id":"GHSA-vjh5-4x84-xrqp","published":"2026-10-22T16:59:55Z","modified":"2026-10-22T17:15:04.297280606Z","aliases":["CVE-2026-114132"],"summary":"Nuxt: Server-side route rules (`redirect`, `headers`, `proxy`, `ssr`) are skipped for case-variant paths when routing is case-insensitive","details":"## Impact\n\nWith the default `router.options.sensitive: false`, Nuxt's page router resolves routes case-insensitively, so `/Admin` renders the same page as `/admin`. On the server, however, route rules were resolved with Nitro's route-rule matcher, which matches keys case-sensitively. A request whose path differs from a rule key only in letter case therefore rendered the page with none of that rule applied.\n\nEarlier fixes ([GHSA-mm7m-92g8-7m47](https://github.com/nuxt/nuxt/security/advisories/GHSA-mm7m-92g8-7m47), [GHSA-hxvh-4h3w-prp9](https://github.com/nuxt/nuxt/security/advisories/GHSA-hxvh-4h3w-prp9)) case-folded the route rules that the Nuxt app itself reads, such as `appMiddleware`. This advisory covers the rules applied on the server:\n\n- `redirect`: a rule used to send visitors away from a page, such as `'/admin/**': { redirect: '/login' }`, was skipped, and the page and its server-fetched data were rendered instead.\n- `headers`: per-route response headers, including security headers such as `Content-Security-Policy` or `X-Frame-Options`, were not sent.\n- `proxy`: the request was not proxied.\n- `ssr: false` and `noScripts`: the page was server-rendered, or shipped scripts, despite the rule.\n- `getRouteRules(event)` (auto-imported, or from `nuxt/server`) and `matchRouteRules` from `nuxt/server` returned no rules for the case variant.\n\n```ts\nexport default defineNuxtConfig({\n  routeRules: {\n    '/admin/**': { redirect: '/login' },\n  },\n})\n```\n\nWith this configuration, `/admin/secret` redirects to `/login`, but `/Admin/secret` rendered `app/pages/admin/secret.vue`.\n\n## Mitigating factors\n\n- Applications that set `router.options.sensitive: true` in `nuxt.config` are not affected, because their pages are only served for the exact case of the route.\n- Access checks performed in server middleware, route middleware attached with `definePageMeta`, or in the page's data fetching are not affected. The issue only affects protections that rely on a server-side route rule matching the request path.\n\n## Affected versions\n\n`nuxt` `<4.6.2`, including all Nuxt 3 releases, and `@nuxt/nitro-server` `<4.6.2`.\n\n## Patches\n\nFixed in `nuxt@4.6.2`. Nuxt 3 reached end of life on 31 July 2026 and will not receive a fix.\n\nNuxt now resolves server-side route rules itself, decoding and case-folding both the rule keys and the request path unless `router.options.sensitive` is set, and applies the result to Nitro's `redirect`, `headers` and `proxy` handling, the renderer, and the `getRouteRules` / `matchRouteRules` helpers.\n\nWhen routing is case-insensitive, patched releases change some behaviour:\n\n- Route rules also apply to case variants of server API routes. For example, `/API/x` now matches a `/api/**` `proxy` or `headers` rule.\n- Rule keys that differ only in letter case now resolve to the same path on the server, and the later key takes precedence.\n\nThe following are not changed by this fix:\n\n- `cache` and `swr` response caching is attached to server routes by Nitro's router, which matches case-sensitively. A case variant is still rendered with its route rules applied, but its response is not cached.\n- Rules that a deployment preset compiles into platform configuration (for example Vercel's `config.json` or Netlify's `_redirects` and `_headers`) are matched by the platform. Once a request reaches the Nuxt server, the rules are applied as described above.\n- If `sensitive` is set only in `app/router.options.ts`, the server follows the `nuxt.config` value. In that configuration route rules can only apply to more paths, never fewer.\n\n## Workarounds\n\nUpgrade to `nuxt@4.6.2`. If you cannot upgrade, including on Nuxt 3:\n\n1. Set `router: { options: { sensitive: true } }` in `nuxt.config`, so pages are only served for the exact case of their route.\n2. Alternatively, enforce access control in server middleware or route middleware rather than relying on a `redirect` route rule, and set security headers for every response rather than per route.","affected":[{"package":{"name":"nuxt","ecosystem":"npm","purl":"pkg:npm/nuxt"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"4.6.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-vjh5-4x84-xrqp/GHSA-vjh5-4x84-xrqp.json"}},{"package":{"name":"nuxt","ecosystem":"npm","purl":"pkg:npm/nuxt"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.0.0"}]}],"database_specific":{"last_known_affected_version_range":"< 4.0.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-vjh5-4x84-xrqp/GHSA-vjh5-4x84-xrqp.json"}},{"package":{"name":"@nuxt/nitro-server","ecosystem":"npm","purl":"pkg:npm/%40nuxt/nitro-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.2.0"},{"fixed":"4.6.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-vjh5-4x84-xrqp/GHSA-vjh5-4x84-xrqp.json"}},{"package":{"name":"@nuxt/nitro-server","ecosystem":"npm","purl":"pkg:npm/%40nuxt/nitro-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.20.0"}]}],"database_specific":{"last_known_affected_version_range":"< 4.0.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-vjh5-4x84-xrqp/GHSA-vjh5-4x84-xrqp.json"}}],"references":[{"type":"WEB","url":"https://github.com/nuxt/nuxt/security/advisories/GHSA-vjh5-4x84-xrqp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114132"},{"type":"WEB","url":"https://github.com/nuxt/nuxt/commit/f6cfee52cf9576ddc4f4ee83b486969328b358f8"},{"type":"PACKAGE","url":"https://github.com/nuxt/nuxt"},{"type":"WEB","url":"https://github.com/nuxt/nuxt/releases/tag/v4.6.2"}],"database_specific":{"cwe_ids":["CWE-178","CWE-863"],"github_reviewed":true,"github_reviewed_at":"2026-10-22T16:59:55Z","nvd_published_at":"2026-10-21T18:17:26Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}]}