CVE-2026-2880

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.0.0,9.2.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "@fastify/middie", "source": "cna", "vendor": "@fastify/middie"}, "product": "middie", "vendor": "fastify"}], "analysis": {"en": {"generated_at": "2026-04-17T13:56:58.665964+00:00", "value": {"mitigation_remediation": ["Upgrade to @fastify/middie 9.2.0 or newer. ", "Disable or remove router normalization features (ignoreDuplicateSlashes, useSemicolonDelimiter, trailing slash handling) that allow path mangling until the upgrade is applied. ", "If the application requires these features, add additional authentication checks at the route handler level or avoid using path\u2011scoped middleware for protected resources."], "summary": {"action": "Immediate Patch", "impact": "Authentication/Authorization bypass via improper path normalization"}, "threat_synthesis": {"affected_systems": "Affected versions are all releases of @fastify/middie earlier than 9.2.0. The product is maintained by OpenJSF and is used by applications built on the Fastify framework. Any deployment that relies on path\u2011scoped middleware with router normalization enabled is susceptible.", "description_and_impact": "The vulnerability is an improper path normalization flaw in @fastify/middie that allows crafted request paths to bypass authentication and authorization checks when path\u2011scoped middleware is used. Attackers can request a protected path such as '/secret' while the middleware is skipped, giving them unintended access. The weakness is classified as CWE\u201120, which reflects improper input validation.", "risk_and_exploitability": "The flaw has a CVSS score of 8.2, indicating high severity, but the EPSS score is less than 1% so exploitation is still considered unlikely at present. It is not listed in CISA's Known Exploited Vulnerabilities catalog. The attack vector requires an HTTP client that can control the request path; if router normalization options such as ignoreDuplicateSlashes or useSemicolonDelimiter are enabled, a crafted URL can trick the router into handling the request without executing the middleware."}}}}, "created": "2026-03-02T12:05:14.244729+00:00", "updated": "2026-04-17T14:00:15.816023+00:00", "vendors": ["fastify", "fastify$PRODUCT$middie"]}