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Attackers can send %2e%2e/ sequences, which decodeURI() decodes before path.join() in serveStaticFile and serveDirectoryListing, to read arbitrary files and list directories outside the root.","state":0,"publishedAt":"2026-10-12T20:55:05.305+00:00","modifiedAt":"2026-10-13T15:46:58.068+00:00","affected":[{"ecosystem":"Vendor product","name":"servor","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"lukejacksonn\",\n                    \"product\": \"servor\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1.0.0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThanOrEqual\": \"4.0.2\"\n                        }\n                    ],\n                    \"packageURL\": \"pkg:npm/servor\",\n                    \"repo\": \"https://github.com/lukejacksonn/servor\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5,"severity":"HIGH"}],"references":["https://github.com/lukejacksonn/servor/pull/70","https://github.com/lukejacksonn/servor/commit/ec7d824ea6903c0fb97a452045bbb8335198cbab","https://github.com/lukejacksonn/servor","https://www.vulncheck.com/advisories/servor-1.0.0-through-4.0.2-unauthenticated-path-traversal-via-url-encoded-dot-segments"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-48011","license":"CVE Program Terms of Use","key":"cve-program:CVE-2021-48011","identifiers":["CVE-2021-48011"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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