Emmett has a path traversal in internal assets handler

{
  "id": "32758906db29ae1f309578377f939aa0499db428b7f02af4c86ffba88343b26b",
  "url": "https://osv.dev/vulnerability/CVE-2026-39847",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Emmett has a path traversal in internal assets handler",
    "summary": "Emmett is a full-stack Python web framework designed with simplicity. From 2.5.0 to before 2.8.1, the RSGI static handler for Emmett's internal assets (/__emmett__ paths) is vulnerable to path traversal attacks. An attacker can use ../ sequences (eg /__emmett__/../rsgi/handlers.py) to read arbitrary files outside the assets directory. This vulnerability is fixed in 2.8.1.",
    "evidence": "osv:CVE-2026-39847",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-39847",
      "aliases": [
        "CVE-2026-39847",
        "GHSA-pr46-2v3c-5356",
        "PYSEC-2026-59"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/emmett-framework/emmett",
              "type": "GIT",
              "events": [
                {
                  "introduced": "db19b6ee077b19afb223926fd2249d39ab74df35"
                },
                {
                  "fixed": "bc367fe574bc9880636e4b0e831c8e588dc49c98"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.5.0"
                      },
                      {
                        "fixed": "2.8.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:emmett:emmett:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.5.0"
                      },
                      {
                        "fixed": "2.8.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.8.0",
            "v2.7.1",
            "v2.7.0",
            "v2.6.3",
            "v2.6.2",
            "v2.6.1",
            "v2.6.0",
            "v2.5.13",
            "v2.5.12",
            "v2.5.11",
            "v2.5.10",
            "v2.5.9",
            "v2.5.8",
            "v2.5.7",
            "v2.5.6",
            "v2.5.5",
            "v2.5.4",
            "v2.5.3",
            "v2.5.2",
            "v2.5.1",
            "v2.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39847.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.714919843Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39847.json",
        "https://github.com/emmett-framework/emmett/security/advisories/GHSA-pr46-2v3c-5356",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-39847"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39847.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-39847",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505240,
  "published_at": "2026-04-07T21:37:54.76+00:00"
}