{"id":"EUVD-2026-22881","revision":"c29e52d1a3ba4ac8a1abdc09bd56bc7b","records":[{"revision":"c29e52d1a3ba4ac8a1abdc09bd56bc7b","observedAt":"2026-11-01T05:16:07.254+00:00","statement":{"source":"euvd","id":"EUVD-2026-22881","aliases":["CVE-2026-33808","GHSA-6hw5-45gm-fj88"],"title":"Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware when Fastify router normalization options are enabled. This allows complete bypass of path-scoped authentication middleware via dupl…","description":"Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware when Fastify router normalization options are enabled. This allows complete bypass of path-scoped authentication middleware via duplicate slashes when ignoreDuplicateSlashes is enabled, or via semicolon delimiters when useSemicolonDelimiter is enabled. In both cases, Fastify router normalizes the URL and matches the route, but @fastify/express passes the original un-normalized URL to Express middleware, which fails to match and is skipped. An unauthenticated attacker can access protected routes by manipulating the URL path.\n\nPatchesUpgrade to @fastify/express v4.0.5 or later.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":9.1,"severity":null}],"references":["https://github.com/fastify/fastify-express/security/advisories/GHSA-6hw5-45gm-fj88","https://cna.openjsf.org/security-advisories.html"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-22881","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Apr 15, 2026, 9:29:46 AM","dateUpdated":"Apr 15, 2026, 1:10:24 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-22881","identifiers":["EUVD-2026-22881","CVE-2026-33808","GHSA-6hw5-45gm-fj88"]},"retained":false,"historicalAffected":[]}],"coverage":[]}