{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.1.4"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/patrickhener/goshs/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.5-0.20260727065949-f3ef599e4091"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.1.4"
      },
      "package": {
        "ecosystem": "Go",
        "name": "goshs.de/goshs/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.5-0.20260727065949-f3ef599e4091"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/patrickhener/goshs"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "goshs.de/goshs"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-66064"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-41",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-28T22:26:28Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\n`sendFile` derives the served filename from the raw request path while opening the file from the cleaned path, so appending a trailing slash empties the derived name and defeats both the never-serve rule for the ACL file and the block list. \n\n## Finding (Medium): trailing-slash ACL and hidden-file bypass\n\nhttpserver/handler.go, sendFile (lines 789-801) takes the filename from the RAW req.URL.Path while the file itself is opened from the filepath.Clean-ed path. The two disagree, and a trailing slash makes the derived name the empty string. Both protections key on that derived name, so both are defeated: the rule that never serves the .goshs ACL file, and the acl.Block list.\n\nMeasured, with negative controls:\n\n```\nGET /blocked/secret.txt    -\u003e 404          (control, correctly blocked)\nGET /blocked/secret.txt/   -\u003e 200 + contents\nGET /blocked/.goshs/       -\u003e 200, returns the ACL file itself,\n                              including the admin:$2a$... bcrypt hash\n```\n\nUnauthenticated when the ACL is configured block-only (common usage). Stated precisely: AUTHENTICATION IS NOT BYPASSED. An unauthenticated request against a directory protected by authentication still returns 401 under the same trick; I tested that. The claim is specifically that the block list and the ACL-file protection are bypassed. In-tree evidence that sendFile is the defect: the sibling handlers doDir and bulkDownload both derive the name correctly; sendFile is the lone outlier.\n\n## Suggested fixes\n\n1. Derive the served filename from the same cleaned path used to open the file, so the authorization decision and the file access cannot disagree.\n\n## Tooling\n\nAI assistance was used while investigating. The finding was reproduced against a running server on loopback with negative controls, including the 404-versus-200 pair and the authenticated-directory control that shows authentication is not affected.",
  "id": "GHSA-964w-f6gj-5236",
  "modified": "2026-07-28T22:26:28Z",
  "published": "2026-07-28T22:26:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/goshs-labs/goshs/security/advisories/GHSA-964w-f6gj-5236"
    },
    {
      "type": "WEB",
      "url": "https://github.com/goshs-labs/goshs/pull/222"
    },
    {
      "type": "WEB",
      "url": "https://github.com/goshs-labs/goshs/commit/f3ef599e409151d1380866e47de8b1afb0bb54fa"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/goshs-labs/goshs"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "goshs has ACL Bypass \u0026 Path Traversal"
}