Security advisory

{
  "id": "7e0b638a9ef13490c0740c2e0e41421c6359be8886657cc9ad2001f05c664a0d",
  "url": "https://osv.dev/vulnerability/CVE-2021-48011",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-48011",
    "summary": "Servor 1.0.0 through 4.0.2 contains a path traversal vulnerability that allows unauthenticated remote attackers to escape the served root by sending URL-encoded dot segments. 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.",
    "evidence": "osv:CVE-2021-48011",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-48011",
      "aliases": [
        "CVE-2021-48011"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/lukejacksonn/servor",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "ec7d824ea6903c0fb97a452045bbb8335198cbab"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "ec7d824ea6903c0fb97a452045bbb8335198cbab"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-48011.json"
          }
        }
      ],
      "modified": "2026-10-24T02:30:51.243502150Z",
      "provider": "osv",
      "references": [
        "https://www.vulncheck.com/advisories/servor-1.0.0-through-4.0.2-unauthenticated-path-traversal-via-url-encoded-dot-segments",
        "https://github.com/lukejacksonn/servor/commit/ec7d824ea6903c0fb97a452045bbb8335198cbab",
        "https://github.com/lukejacksonn/servor/pull/70",
        "https://github.com/lukejacksonn/servor"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "1.0.0"
                  },
                  {
                    "last_affected": "4.0.2"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-48011",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 428158,
  "published_at": "2026-10-12T21:17:05.903+00:00"
}