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FrankenPHP: Docker images serve phpinfo() as the default index.php, leaking environment variables

Type: advisorySources: OSV

FrankenPHP is a modern application server for PHP. Prior to 1.12.5, the official FrankenPHP Debian and Alpine Docker images include a default /app/public/index.php that executes phpinfo(). A derived image that does not overwrite this placeholder serves the diagnostics page in production and can disclose environment variables used for secrets, PHP configuration directives, loaded extensions, software versions, and system paths. Images built using the documented pattern with their own /app/public/index.php are not affected, and already derived images must be rebuilt or supplied with an application index to remove the exposed placeholder. This issue is fixed in version 1.12.5.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-85733
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 13:21 UTC · Revision 1

Source evidence

FrankenPHP: Docker images serve phpinfo() as the default index.php, leaking environment variables

core-osv · Original source

Published 13 Oct 2026, 16:23 UTC

FrankenPHP is a modern application server for PHP. Prior to 1.12.5, the official FrankenPHP Debian and Alpine Docker images include a default /app/public/index.php that executes phpinfo(). A derived image that does not overwrite this placeholder serves the diagnostics page in production and can disclose environment variables used for secrets, PHP configuration directives, loaded extensions, software versions, and system paths. Images built using the documented pattern with their own /app/public/index.php are not affected, and already derived images must be rebuilt or supplied with an application index to remove the exposed placeholder. This issue is fixed in version 1.12.5.

osv:CVE-2026-85733
Complete source record
{
  "id": "64387e1d6042eb3dcd4fe404de0caa6f6a1801a2bf0ef8f5eb5094dfcf0d5c56",
  "url": "https://osv.dev/vulnerability/CVE-2026-85733",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "FrankenPHP: Docker images serve phpinfo() as the default index.php, leaking environment variables",
    "summary": "FrankenPHP is a modern application server for PHP. Prior to 1.12.5, the official FrankenPHP Debian and Alpine Docker images include a default /app/public/index.php that executes phpinfo(). A derived image that does not overwrite this placeholder serves the diagnostics page in production and can disclose environment variables used for secrets, PHP configuration directives, loaded extensions, software versions, and system paths. Images built using the documented pattern with their own /app/public/index.php are not affected, and already derived images must be rebuilt or supplied with an application index to remove the exposed placeholder. This issue is fixed in version 1.12.5.",
    "evidence": "osv:CVE-2026-85733",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-85733",
      "aliases": [
        "CVE-2026-85733",
        "GHSA-cj57-c655-p798"
      ],
      "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/php/frankenphp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "e41b848eb9f7517088a77f2836cee68da1be234b"
                },
                {
                  "fixed": "17940ff2ee188a1e48aabd10c095df72b42539e0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.12.5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "17940ff2ee188a1e48aabd10c095df72b42539e0"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.12.4",
            "caddy/v1.12.4",
            "v1.12.3",
            "caddy/v1.12.3",
            "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",
            "v1.11.1",
            "caddy/v1.11.1",
            "v1.11.0",
            "caddy/v1.11.0",
            "v1.10.1",
            "caddy/v1.10.1",
            "v1.10.0",
            "caddy/v1.10.0",
            "v1.9.1",
            "caddy/v1.9.1",
            "v1.9.0",
            "caddy/v1.9.0",
            "v1.8.0",
            "caddy/v1.8.0",
            "v1.7.0",
            "caddy/v1.7.0",
            "v1.6.2",
            "caddy/v1.6.2",
            "v1.6.1",
            "caddy/v1.6.1",
            "v1.6.0",
            "caddy/v1.6.0",
            "v1.5.0",
            "caddy/v1.5.0",
            "v1.4.4",
            "caddy/v1.4.4",
            "v1.4.3",
            "caddy/v1.4.3",
            "v1.4.2",
            "caddy/v1.4.2",
            "v1.4.1",
            "caddy/v1.4.1",
            "v1.4.0",
            "caddy/v1.4.0",
            "v1.3.6",
            "caddy/v1.3.6",
            "v1.3.5",
            "caddy/v1.3.5",
            "v1.3.4",
            "caddy/v1.3.4",
            "v1.3.3",
            "caddy/v1.3.3",
            "v1.3.2",
            "caddy/v1.3.2",
            "v1.3.1",
            "caddy/v1.3.1",
            "v1.3.0",
            "caddy/v1.3.0",
            "v1.2.5",
            "caddy/v1.2.5",
            "v1.2.4",
            "caddy/v1.2.4",
            "v1.2.3",
            "caddy/v1.2.3",
            "v1.2.2",
            "caddy/v1.2.2",
            "v1.2.1",
            "caddy/v1.2.1",
            "v1.2.0",
            "caddy/v1.2.0",
            "v1.1.5",
            "caddy/v1.1.5",
            "v1.1.4",
            "caddy/v1.1.4",
            "v1.1.3",
            "caddy/v1.1.3",
            "v1.1.2",
            "caddy/v1.1.2",
            "v1.1.1",
            "caddy/v1.1.1",
            "v1.1.0",
            "caddy/v1.1.0",
            "v1.0.3",
            "caddy/v1.0.3",
            "v1.0.2",
            "caddy/v1.0.2",
            "v1.0.1",
            "caddy/v1.0.1",
            "v1.0.0",
            "caddy/v1.0.0",
            "v1.0.0-rc.4",
            "caddy/v1.0.0-rc.4",
            "v1.0.0-rc.3",
            "caddy/v1.0.0-rc.3",
            "v1.0.0-rc.2",
            "caddy/v1.0.0-rc.2",
            "v1.0.0-beta.2",
            "caddy/v1.0.0-beta.2",
            "v1.0.0-beta.1",
            "caddy/v1.0.0-beta.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85733.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.702221687Z",
      "provider": "osv",
      "references": [
        "https://github.com/php/frankenphp/releases/tag/caddy/v1.12.5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85733.json",
        "https://github.com/php/frankenphp/security/advisories/GHSA-cj57-c655-p798",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-85733",
        "https://github.com/php/frankenphp/commit/17940ff2ee188a1e48aabd10c095df72b42539e0",
        "https://github.com/php/frankenphp/pull/2524"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85733.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-85733",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519432,
  "published_at": "2026-10-13T16:23:07.177+00:00"
}