{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.15.0"
              },
              {
                "fixed": "0.18.0"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "fb4cc367b85b68d90b99be692dcbbbfc248c1adb"
            },
            {
              "fixed": "808e4b17ee821a8dac98bda5bf01da0fe1b69d41"
            },
            {
              "fixed": "5165f752f5f92b755d946f2d1ce750ff69083ffc"
            }
          ],
          "repo": "https://github.com/ash-project/ash_typescript",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-6g23-p936-fm2f"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-601"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82731.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "6669e22ece34b4534e706a46d1842f01b68ee23a"
          },
          {
            "fixed": "5165f752f5f92b755d946f2d1ce750ff69083ffc"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "URL Redirection to Untrusted Site ('Open Redirect') vulnerability in ash-project ash_typescript allows an attacker who controls a path-parameter value to redirect a generated client's request, and the credentials attached to it, to an unintended route or an external origin.\n\nThe URL builders in lib/ash_typescript/typed_controller/codegen/route_renderer.ex replace each :param placeholder with a bare template interpolation and never call encodeURIComponent, so the value reaches executeTypedControllerRequest raw. A value containing ../ is normalised away by the fetch URL resolver and reaches a different route, while ? or # truncates the path and can smuggle or override query parameters. For a route whose path begins with a parameter, a value such as /evil.example.com/x yields the protocol-relative URL //evil.example.com/x, sending the request and the credentials from TypedControllerConfig to an attacker-controlled host. Nothing constrains the value at runtime: get_path_param_type/2 emits only a TypeScript type, which is erased.\n\nThe query-string path is unaffected, since URLSearchParams.set encodes its own values.\n\nThis issue affects ash_typescript: from 0.15.0 before 0.18.0.",
  "id": "CVE-2026-82731",
  "modified": "2026-09-02T03:30:50.695380714Z",
  "published": "2026-09-01T02:09:38.801Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-82731.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-82731"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82731.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6g23-p936-fm2f"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82731"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ash-project/ash_typescript/commit/5165f752f5f92b755d946f2d1ce750ff69083ffc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ash-project/ash_typescript"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Unescaped path parameters in AshTypescript generated TypeScript client allow request redirection"
}