---
id: CVE-2026-85733
title: FrankenPHP is a modern application server for PHP
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 pla…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-200
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T18:17:26.160'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85733'
references:
  - url: >-
      https://github.com/php/frankenphp/commit/17940ff2ee188a1e48aabd10c095df72b42539e0
    label: security-advisories@github.com
  - url: 'https://github.com/php/frankenphp/pull/2524'
    label: security-advisories@github.com
  - url: 'https://github.com/php/frankenphp/releases/tag/caddy/v1.12.5'
    label: security-advisories@github.com
  - url: 'https://github.com/php/frankenphp/security/advisories/GHSA-cj57-c655-p798'
    label: security-advisories@github.com
tags:
  - nvd
ingestedAt: '2026-10-13T17:38:53.200Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.