{"schemaVersion":3,"id":"CVE-2026-90982","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"@fastify/static is a Fastify plugin that serves static files from a configured root directory. In versions before 10.1.4, on a case-insensitive filesystem such as Windows or the default macOS volume, a route guard or allowedPath restriction can be bypassed by altering the letter case of a path segment. The route matcher is case-sensitive while the filesystem is not, so a request that changes the case of a protected segment does not match the guarded route and falls through to the static handler, yet the filesystem resolves it to the same protected file. As a result, an unauthenticated request can read a file that a route guard or allowedPath was configured to protect. The issue does not affect case-sensitive filesystems and is not a directory traversal, since nothing is served from outside the configured root. The issue is fixed in @fastify/static 10.1.4, which validates the requested path against its actual on-disk spelling and rejects case-aliased paths before authorization. As a workaround, serve static files from a case-sensitive filesystem, or ensure route guards and allowedPath rules account for every letter-case variant of the protected paths.","dates":{"published":"2026-09-17T06:55:42.300Z","modified":"2026-09-17T12:33:23.661Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00585,"percentile":0.46974,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.22800000000000004,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00357},"history":[{"date":"2026-09-17T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00585,"percentile":0.46974}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00585,"percentile":null},{"date":"2026-10-13T00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