{"id":"CVE-2026-112362","revision":null,"records":[{"revision":"fae2e539520c473aba6e848e2aeaa2f5","observedAt":"2026-10-27T13:09:22.002+00:00","statement":{"source":"cve-program","id":"CVE-2026-112362","aliases":[],"title":"@fastify/express vulnerable to path-scoped middleware bypass via absolute-form request targets","description":"@fastify/express is a Fastify plugin that runs Express middleware inside Fastify. In versions 4.0.5 through 4.0.8, when Fastify runs with the non-default ignoreDuplicateSlashes option enabled, the plugin matches path-scoped Express middleware against a URL whose duplicate-slash normalization has also collapsed the separator after an absolute-form request target's scheme, so Fastify's router resolves the request to the scoped path and runs the handler while the Express layer no longer sees that path. As a result, a request using an absolute-form target can reach a handler on a scoped route such as an admin path while the middleware for authentication, authorization, or rate limiting is skipped. An unauthenticated attacker needs only the non-default ignoreDuplicateSlashes option to be enabled. The issue is fixed in @fastify/express 4.0.9, and users should upgrade to 4.0.9 or later. As a workaround, enforce authentication in a Fastify hook such as preHandler that runs after the router resolves the request, or leave ignoreDuplicateSlashes at its default.","state":0,"publishedAt":"2026-10-27T11:27:59.364+00:00","modifiedAt":"2026-10-27T11:27:59.364+00:00","affected":[{"ecosystem":"Vendor product","name":"@fastify/express","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"@fastify/express\",\n                    \"product\": \"@fastify/express\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"affected\",\n                            \"version\": \"4.0.5\",\n                            \"lessThan\": \"4.0.9\"\n                        },\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"unaffected\",\n                            \"version\": \"4.0.9\"\n                        }\n                    ],\n                    \"packageURL\": \"pkg:npm/@fastify/express\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1,"severity":"CRITICAL"}],"references":["https://github.com/fastify/fastify-express/security/advisories/GHSA-6h42-57hq-9746","https://cna.openjsf.org/security-advisories.html"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-112362","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-112362","identifiers":["CVE-2026-112362"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-01T07:04:54.9851191+00:00","complete":true,"records":1766,"lastAttemptAt":"2026-11-01T07:04:54.9851191+00:00","lastSuccessAt":"2026-11-01T07:04:55.1523444+00:00","error":null,"lastVerifiedAt":"2026-11-01T07:04:55.1523511+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-aece262bb10a694367a43c24d730aa8e8dc171723eaec4c15cdd32f04bda103f-7102d048e7a0fc351d343b19a24d2d3e1b90ccdb6994776de85faef02dd3b113","complete":true,"records":417620,"lastAttemptAt":"2026-11-01T07:04:54.4159535+00:00","lastSuccessAt":"2026-11-01T07:04:54.3752669+00:00","error":null,"lastVerifiedAt":"2026-11-01T07:04:54.4159535+00:00","snapshotPublishedAt":"2026-11-01T06:30:40+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-c6fb1f32c6754b21a98f51facdb3651d","complete":false,"records":13567,"lastAttemptAt":"2026-11-01T07:17:06.2762505+00:00","lastSuccessAt":"2026-11-01T07:17:06.272+00:00","error":"84 identifier lookups failed; latest failures include HTTP 403. Other identifiers were checked independently.","lastVerifiedAt":"2026-11-01T07:17:06.272+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13553,"expectedIdentifiers":13637,"failedIdentifiers":84},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-01T07:04:54.9851191+00:00","complete":true,"records":1095,"lastAttemptAt":"2026-11-01T07:04:54.9851191+00:00","lastSuccessAt":"2026-11-01T07:04:55.1534437+00:00","error":null,"lastVerifiedAt":"2026-11-01T07:04:55.1534441+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-cb479fb73dd0432cb8c82ee43f01837b","complete":true,"records":13580,"lastAttemptAt":"2026-11-01T07:04:55.6858262+00:00","lastSuccessAt":"2026-11-01T04:04:52.54+00:00","error":null,"lastVerifiedAt":"2026-11-01T04:04:52.54+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13637,"expectedIdentifiers":13637,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-21dcd6662970dfea02e4ea60ee637115e8d92664947484d2b9276b3f6568a84f","complete":true,"records":9815,"lastAttemptAt":"2026-11-01T07:04:54.7867167+00:00","lastSuccessAt":"2026-10-30T23:47:34.1817587+00:00","error":null,"lastVerifiedAt":"2026-11-01T07:04:54.7867167+00:00","snapshotPublishedAt":"2026-10-30T23:33:17+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-2de9ccc5290f060c7aa63f89c25dd76f655a64ba1aba7c05c97fa3bee4f09899","complete":true,"records":1967,"lastAttemptAt":"2026-11-01T07:04:54.5787008+00:00","lastSuccessAt":"2026-10-28T20:55:34.2982937+00:00","error":null,"lastVerifiedAt":"2026-11-01T07:04:54.5787008+00:00","snapshotPublishedAt":"2026-10-28T20:03:08+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-f95f76cd406ae5bae3de632ad37fd2d5160b44f5e6b51748ac6f8f0c0c88e72b","complete":true,"records":3028,"lastAttemptAt":"2026-11-01T07:04:54.948668+00:00","lastSuccessAt":"2026-10-30T23:47:38.4914494+00:00","error":null,"lastVerifiedAt":"2026-11-01T07:04:54.948668+00:00","snapshotPublishedAt":"2026-10-30T23:18:12+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-712291bb5a0ee4f1ca7325e317f98ff05e9ab8d14f863abf00a323d9e6d8331e","complete":true,"records":230994,"lastAttemptAt":"2026-11-01T07:04:54.6859859+00:00","lastSuccessAt":"2026-10-31T17:06:47.8999408+00:00","error":null,"lastVerifiedAt":"2026-11-01T07:04:54.6859859+00:00","snapshotPublishedAt":"2026-10-31T16:33:38+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}