Emissary has a Path Traversal via Blacklist Bypass in Configuration API

{
  "id": "22490f8979b3883f3755b6be1c843e96d144edc2ff21a475a6460ebf7162f089",
  "url": "https://osv.dev/vulnerability/CVE-2026-35583",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Emissary has a Path Traversal via Blacklist Bypass in Configuration API",
    "summary": "Emissary is a P2P based data-driven workflow engine. Prior to 8.39.0, the configuration API endpoint (/api/configuration/{name}) validated configuration names using a blacklist approach that checked for \\, /, .., and trailing .. This could potentially be bypassed using URL-encoded variants, double-encoding, or Unicode normalization to achieve path traversal and read configuration files outside the intended directory. This vulnerability is fixed in 8.39.0.",
    "evidence": "osv:CVE-2026-35583",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-35583",
      "aliases": [
        "CVE-2026-35583",
        "GHSA-hxf2-gm22-7vcm"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nationalsecurityagency/emissary",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5e3d58513b4cc0362537c60f21983d62ddf40599"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "8.39.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:nsa:emissary:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "8.38.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "7.19.0",
            "emissary-7.19.0",
            "7.18.0",
            "7.17.0",
            "7.16.0",
            "7.15.0",
            "7.14.0",
            "7.13.0",
            "7.12.0",
            "7.11.0",
            "7.10.0",
            "7.9.0",
            "7.8.0",
            "7.7.0",
            "7.6.0",
            "7.5.0",
            "7.4.0",
            "7.3.0",
            "7.2.0",
            "7.1.0",
            "7.0.0",
            "6.6.0",
            "6.5.0",
            "6.4.0",
            "6.3.0",
            "6.2.0",
            "6.1.0",
            "6.0.0",
            "5.11.0",
            "5.10.0",
            "5.9.0",
            "5.8.0",
            "5.7.0",
            "5.6.0",
            "5.5.0",
            "5.4.1",
            "5.3.0",
            "5.2.0",
            "5.1.0",
            "5.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35583.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.577651546Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35583.json",
        "https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-hxf2-gm22-7vcm",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-35583"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35583.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-35583",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500465,
  "published_at": "2026-04-07T15:57:41.496+00:00"
}