FrankenPHP: Unsafe Unicode Handling in CGI Path Splitting Allows Execution of Non-PHP Files

{
  "id": "37b95a1d5a03b17d6d5f9e2645bd6d8c4a8acac40c85ae5bb01544ba18878d12",
  "url": "https://osv.dev/vulnerability/CVE-2026-45062",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "FrankenPHP: Unsafe Unicode Handling in CGI Path Splitting Allows Execution of Non-PHP Files",
    "summary": "FrankenPHP is a modern application server for PHP. From version 1.11.2 to before version 1.12.3, the splitPos() function in cgi.go misuses golang.org/x/text/search with search.IgnoreCase when the request path contains a non-ASCII byte. Two distinct flaws in that fallback let an attacker mislead FrankenPHP into treating a non-.php file as a .php script. In any deployment where the attacker can place content into a file served by FrankenPHP (uploads, file storage, etc.), this can be escalated to remote code execution by crafting a URL whose path triggers either flaw. This issue has been patched in version 1.12.3.",
    "evidence": "osv:CVE-2026-45062",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-45062",
      "aliases": [
        "CVE-2026-45062",
        "GHSA-3g8v-8r37-cgjm",
        "GO-2026-5084"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/php/frankenphp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3aa71fd4282f017b8a953332548b0bf89950119c"
                },
                {
                  "fixed": "86fb32e829cbb414df74e1f1c23855915d399ac5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.11.2"
                      },
                      {
                        "fixed": "1.12.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "86fb32e829cbb414df74e1f1c23855915d399ac5"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.12.3"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.12.3"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.12.2",
            "caddy/v1.12.2",
            "v1.12.1",
            "caddy/v1.12.1",
            "v1.12.0",
            "caddy/v1.12.0",
            "v1.11.3",
            "caddy/v1.11.3",
            "v1.11.2",
            "caddy/v1.11.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45062.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.977698487Z",
      "provider": "osv",
      "references": [
        "https://github.com/php/frankenphp/releases/tag/v1.12.3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45062.json",
        "https://github.com/php/frankenphp/security/advisories/GHSA-3g8v-8r37-cgjm",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-45062"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-176",
          "CWE-178",
          "CWE-20"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45062.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-45062",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494838,
  "published_at": "2026-06-10T17:38:42.454+00:00"
}