{"id":"CVE-2026-71315","aliases":["EUVD-2026-53645","GHSA-hxvh-4h3w-prp9"],"status":"published","title":"Nuxt route rules silently dropped for mixed-case paths, bypassing appMiddleware auth gates (incomplete fix for CVE-2026-53721)","description":"Nuxt is an open-source web development framework for Vue.js. From 3.21.7 until 3.21.10 and 4.5.1, mixed-case routeRules keys can fail to match case-folded lookups when router.options.sensitive is false and drop appMiddleware authorization gates. This is caused by an incomplete fix for CVE-2026-53721. This issue is fixed in 3.21.10 and 4.5.1.","severity":{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00466,"percentile":0.40797,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-178","CWE-863"],"published":"2026-08-05T21:05:15Z","modified":"2026-10-28T02:30:47Z","fixes":[{"ecosystem":"npm","package":"nuxt","fixed_in":["4.5.1","3.21.10"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"nuxt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.4.7"},{"fixed":"4.5.1"}]}]},{"source":"ghsa","ecosystem":"npm","package":"nuxt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.21.7"},{"fixed":"3.21.10"}]}]},{"source":"osv","ecosystem":"npm","package":"nuxt","ranges":[{"type":"SEMVER","events":[{"introduced":"4.4.7"},{"fixed":"4.5.1"}]}]},{"source":"osv","ecosystem":"npm","package":"nuxt","ranges":[{"type":"SEMVER","events":[{"introduced":"3.21.7"},{"fixed":"3.21.10"}]}]}],"products":[{"vendor":"@clerk","product":"nuxt"},{"vendor":"nuxt","product":"nuxt"}],"references":[{"url":"https://github.com/nuxt/nuxt/security/advisories/GHSA-hxvh-4h3w-prp9","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/nuxt/nuxt/commit/619963309e082190bac4a26b05f2dd155b039b81","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/nuxt/nuxt/commit/ad624a75ad2d215f43633f6b40be346a7194d34d","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/nuxt/nuxt/releases/tag/v3.21.10","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/nuxt/nuxt/releases/tag/v4.5.1","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/advisories/GHSA-hxvh-4h3w-prp9"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71315.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71315","tags":["advisory"]},{"url":"https://github.com/nuxt/nuxt","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-71315","title":"Nuxt route rules silently dropped for mixed-case paths, bypassing appMiddleware auth gates (incomplete fix for CVE-2026-53721)","description":"Nuxt is an open-source web development framework for Vue.js. From 3.21.7 until 3.21.10 and 4.5.1, mixed-case routeRules keys can fail to match case-folded lookups when router.options.sensitive is false and drop appMiddleware authorization gates. This is caused by an incomplete fix for CVE-2026-53721. This issue is fixed in 3.21.10 and 4.5.1.","status":"published","published":"2026-08-05T21:05:15.379Z","modified":"2026-08-06T13:46:35.243Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-178","CWE-863"],"updated_at":"2026-11-02T14:19:49.559463Z"}],"euvd":[{"id":"EUVD-2026-53645","description":"Nuxt is an open-source web development framework for Vue.js. From 3.21.7 until 3.21.10 and 4.5.1, mixed-case routeRules keys can fail to match case-folded lookups when router.options.sensitive is false and drop appMiddleware authorization gates. This is caused by an incomplete fix for CVE-2026-53721. This issue is fixed in 3.21.10 and 4.5.1.","status":"published","published":"2026-08-05T21:05:15Z","modified":"2026-08-06T13:46:35Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"high"}],"updated_at":"2026-11-02T18:02:09.043832Z"}],"ghsa":[{"id":"GHSA-hxvh-4h3w-prp9","title":"Nuxt route rules silently dropped for mixed-case paths, bypassing appMiddleware auth gates (incomplete fix for CVE-2026-53721)","description":"### Impact\n\nNuxt matches route rules case-insensitively by default (mirroring vue-router's default `sensitive: false` routing). The fix for GHSA-mm7m-92g8-7m47 / CVE-2026-53721 lowercased the *lookup* path before matching route rules, but the route-rule *keys* compiled into the matcher were left verbatim. As a result, any route rule whose key contains an uppercase character (for example `/Admin`, `/Dashboard/**`, or the rules Nuxt derives from PascalCase/camelCase page files such as `pages/Admin.vue`) never matches, because every lookup is folded to lowercase while the key stays mixed-case.\n\nvue-router still serves the page case-insensitively, so the page renders with none of its Nuxt route-rule protections applied. The most serious consequence is an authorization bypass: an `appMiddleware` rule used as an auth gate (`routeRules: { '/Admin/dashboard': { appMiddleware: 'auth' } }`) is dropped, and `/Admin/dashboard`, `/admin/dashboard`, and `/ADMIN/dashboard` all render the protected page (and its SSR-fetched data) to an unauthenticated visitor instead of redirecting to login. The same gap drops Nuxt's other app-side route-rule behaviours for mixed-case keys, including the client redirect middleware, the app-side `ssr: false` decision, `prerender`, and payload handling.\n\n### Patches\n\nFixed in `nuxt@4.5.1` (4.x) and `nuxt@3.21.10` (3.x). The route-rule matcher now case-folds the compiled keys the same way it folds the lookup path, so key and lookup normalisation are symmetric. Both sides are gated on `router.options.sensitive`: with `sensitive: true` (case-sensitive routing) configured casing is preserved on both sides.\n\nScope note: server-emitted per-route `headers`, server `redirect`, and `proxy` are matched by Nitro's own case-sensitive route-rule matcher, not by Nuxt's app-level matcher. They are unchanged by this advisory. The fix covers the app-level protections Nuxt owns (`appMiddleware`, `appLayout`, the client redirect middleware, the app `ssr` decision, `prerender`, and payload).\n\n### Workarounds\n\nIf you cannot upgrade immediately, any one of:\n\n- Key all `routeRules` (and name your page files) in lowercase, so the keys already match the folded lookup path.\n- Set `router: { options: { sensitive: true } }` so routing and route-rule matching are both case-sensitive and exact (requests must then use the exact casing).\n- Enforce the sensitive protections server-side independently of route rules (for example a server middleware that checks auth), which does not rely on case-insensitive route-rule matching.","status":"published","published":"2026-08-05T21:05:18Z","modified":"2026-08-05T21:05:19Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"high"}],"cwes":["CWE-178","CWE-863"],"updated_at":"2026-11-02T14:40:57.999375Z"}],"nvd":[{"id":"CVE-2026-71315","description":"Nuxt is an open-source web development framework for Vue.js. From 3.21.7 until 3.21.10 and 4.5.1, mixed-case routeRules keys can fail to match case-folded lookups when router.options.sensitive is false and drop appMiddleware authorization gates. This is caused by an incomplete fix for CVE-2026-53721. This issue is fixed in 3.21.10 and 4.5.1.","status":"published","published":"2026-08-05T21:16:59.297Z","modified":"2026-09-08T20:51:43.49Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-178","CWE-863"],"updated_at":"2026-11-02T14:12:35.031043Z"}],"osv":[{"id":"CVE-2026-71315","title":"Nuxt route rules silently dropped for mixed-case paths, bypassing appMiddleware auth gates (incomplete fix for CVE-2026-53721)","description":"Nuxt is an open-source web development framework for Vue.js. From 3.21.7 until 3.21.10 and 4.5.1, mixed-case routeRules keys can fail to match case-folded lookups when router.options.sensitive is false and drop appMiddleware authorization gates. This is caused by an incomplete fix for CVE-2026-53721. This issue is fixed in 3.21.10 and 4.5.1.","status":"published","published":"2026-08-05T21:05:15.379Z","modified":"2026-10-28T02:30:47.945286695Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"high"}],"cwes":["CWE-178","CWE-863"],"updated_at":"2026-11-02T15:45:15.164658Z"},{"id":"GHSA-hxvh-4h3w-prp9","title":"Nuxt route rules silently dropped for mixed-case paths, bypassing appMiddleware auth gates (incomplete fix for CVE-2026-53721)","description":"### Impact\n\nNuxt matches route rules case-insensitively by default (mirroring vue-router's default `sensitive: false` routing). The fix for GHSA-mm7m-92g8-7m47 / CVE-2026-53721 lowercased the *lookup* path before matching route rules, but the route-rule *keys* compiled into the matcher were left verbatim. As a result, any route rule whose key contains an uppercase character (for example `/Admin`, `/Dashboard/**`, or the rules Nuxt derives from PascalCase/camelCase page files such as `pages/Admin.vue`) never matches, because every lookup is folded to lowercase while the key stays mixed-case.\n\nvue-router still serves the page case-insensitively, so the page renders with none of its Nuxt route-rule protections applied. The most serious consequence is an authorization bypass: an `appMiddleware` rule used as an auth gate (`routeRules: { '/Admin/dashboard': { appMiddleware: 'auth' } }`) is dropped, and `/Admin/dashboard`, `/admin/dashboard`, and `/ADMIN/dashboard` all render the protected page (and its SSR-fetched data) to an unauthenticated visitor instead of redirecting to login. The same gap drops Nuxt's other app-side route-rule behaviours for mixed-case keys, including the client redirect middleware, the app-side `ssr: false` decision, `prerender`, and payload handling.\n\n### Patches\n\nFixed in `nuxt@4.5.1` (4.x) and `nuxt@3.21.10` (3.x). The route-rule matcher now case-folds the compiled keys the same way it folds the lookup path, so key and lookup normalisation are symmetric. Both sides are gated on `router.options.sensitive`: with `sensitive: true` (case-sensitive routing) configured casing is preserved on both sides.\n\nScope note: server-emitted per-route `headers`, server `redirect`, and `proxy` are matched by Nitro's own case-sensitive route-rule matcher, not by Nuxt's app-level matcher. They are unchanged by this advisory. The fix covers the app-level protections Nuxt owns (`appMiddleware`, `appLayout`, the client redirect middleware, the app `ssr` decision, `prerender`, and payload).\n\n### Workarounds\n\nIf you cannot upgrade immediately, any one of:\n\n- Key all `routeRules` (and name your page files) in lowercase, so the keys already match the folded lookup path.\n- Set `router: { options: { sensitive: true } }` so routing and route-rule matching are both case-sensitive and exact (requests must then use the exact casing).\n- Enforce the sensitive protections server-side independently of route rules (for example a server middleware that checks auth), which does not rely on case-insensitive route-rule matching.","status":"published","published":"2026-08-05T21:05:18Z","modified":"2026-08-05T21:25:59.70379Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"high"}],"cwes":["CWE-178","CWE-863"],"updated_at":"2026-11-02T15:46:49.621585Z"}]}}