{
  "assigner": "ENISA",
  "date_reserved": "2026-10-03T10:47:50.280063+00:00",
  "id": "EUVD-2026-51895"
}

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "frankenphp",
          "vendor": "php",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.11.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:php:frankenphp:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E2C3D161-7DC3-4241-9EBA-481806A802B5",
              "versionEndExcluding": "1.11.2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "FrankenPHP is a modern application server for PHP. Prior to 1.11.2, FrankenPHP\u2019s CGI path splitting logic improperly handles Unicode characters during case conversion. The logic computes the split index (for finding .php) on a lowercased copy of the request path but applies that byte index to the original path. Because strings.ToLower() in Go can increase the byte length of certain UTF-8 characters (e.g., \u023a expands when lowercased), the computed index may not align with the correct position in the original string. This results in an incorrect SCRIPT_NAME and SCRIPT_FILENAME, potentially causing FrankenPHP to execute a file other than the one intended by the URI. This vulnerability is fixed in 1.11.2."
    },
    {
      "lang": "es",
      "value": "FrankenPHP es un moderno servidor de aplicaciones para PHP. Antes de 1.11.2, la l\u00f3gica de divisi\u00f3n de rutas CGI de FrankenPHP maneja incorrectamente los caracteres Unicode durante la conversi\u00f3n de may\u00fasculas y min\u00fasculas. La l\u00f3gica calcula el \u00edndice de divisi\u00f3n (para encontrar .php) en una copia en min\u00fasculas de la ruta de la solicitud, pero aplica ese \u00edndice de bytes a la ruta original. Debido a que strings.ToLower() en Go puede aumentar la longitud en bytes de ciertos caracteres UTF-8 (por ejemplo, ? se expande al convertirse a min\u00fasculas), el \u00edndice calculado puede no alinearse con la posici\u00f3n correcta en la cadena original. Esto resulta en un SCRIPT_NAME y SCRIPT_FILENAME incorrectos, potencialmente causando que FrankenPHP ejecute un archivo diferente al previsto por la URI. Esta vulnerabilidad est\u00e1 corregida en 1.11.2."
    }
  ],
  "id": "CVE-2026-24895",
  "lastModified": "2026-06-17T10:23:46.000",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.9,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "PROOF_OF_CONCEPT",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-24895",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-12T20:03:49.803836Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-12T20:16:10.170",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/php/frankenphp/commit/04fdc0c1e8fde94e2c1ad86217e962c88d27c53e"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/php/frankenphp/releases/tag/v1.11.2"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/php/frankenphp/security/advisories/GHSA-g966-83w7-6w38"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-180"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/dunglas/frankenphp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.11.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-24895"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-180",
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-12T15:29:36Z",
    "nvd_published_at": "2026-02-12T20:16:10Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nFrankenPHP\u2019s CGI path splitting logic improperly handles Unicode characters during case conversion. The logic computes the split index (for finding `.php`) on a lowercased copy of the request path but applies that byte index to the original path.\n\nBecause `strings.ToLower()` in Go can increase the byte length of certain UTF-8 characters (e.g., `\u023a` expands when lowercased), the computed index may not align with the correct position in the original string. This results in an incorrect `SCRIPT_NAME` and `SCRIPT_FILENAME`, potentially causing FrankenPHP to execute a file other than the one intended by the URI.\n\n### **Details**\n\nThe vulnerability resides in the `splitPos()` function and its usage within `splitCgiPath()`. The logic attempts to find the script extension (e.g., `.php`) in a case-insensitive manner by lowercasing the path:\n\n```go\nlowerPath := strings.ToLower(path)\nidx := strings.Index(lowerPath, strings.ToLower(split))\nreturn idx + len(split)\n```\n\nThe issue is that the returned `idx` represents a byte offset within `lowerPath`. However, `splitCgiPath()` uses this index to slice the **original** `path`:\n\n```go\nfc.docURI = path[:splitPos]\nfc.pathInfo = path[splitPos:]\nfc.scriptName = strings.TrimSuffix(path, fc.pathInfo)\nfc.scriptFilename = sanitizedPathJoin(fc.documentRoot, fc.scriptName)\n```\n\nThis logic relies on the assumption that `len(strings.ToLower(path)) == len(path)`. This assumption is false for certain Unicode characters. For example, the character `\u023a` (U+023A) requires 2 bytes in UTF-8 (`0xC8 0xBA`), but its lowercase equivalent `\u2c65` (U+2C65) requires 3 bytes (`0xE2 0xB1 0xA5`).\n\nIf the path contains such characters before the `.php` extension, the index calculated on `lowerPath` will be larger than the corresponding visual point in the original `path`. When applied to the original path, the split occurs at the wrong byte offset. This can cause the server to treat a larger portion of the path as the script name, effectively allowing an attacker to manipulate `SCRIPT_FILENAME`.\n\n### **PoC**\n\nThe following Go program demonstrates the discrepancy between the byte index in the lowercased string versus the original string.\n\n1. Save the following as `poc.go`:\n\n```go\npackage main\n\nimport (\n    \"fmt\"\n    \"strings\"\n)\n\nfunc splitPos(path string, split string) int {\n    lowerPath := strings.ToLower(path)\n    idx := strings.Index(lowerPath, strings.ToLower(split))\n    if idx \u003c 0 {\n        return -1\n    }\n    return idx + len(split)\n}\n\nfunc main() {\n    // U+023A: \u023a (UTF-8: C8 BA). Lowercase is \u2c65 (UTF-8: E2 B1 A5), longer in bytes.\n    // We construct a path where the byte expansion shifts the index.\n    path := \"/\u023a\u023a\u023a\u023ashell.php.txt.php\"\n    split := \".php\"\n\n    pos := splitPos(path, split)\n\n    fmt.Printf(\"orig bytes=%d\\n\", len(path))\n    fmt.Printf(\"lower bytes=%d\\n\", len(strings.ToLower(path)))\n    fmt.Printf(\"splitPos=%d\\n\", pos)\n\n    // Current Unsafe Behavior:\n    fmt.Printf(\"orig[:pos] (Calculated Script)=%q\\n\", path[:pos])\n    fmt.Printf(\"orig[pos:] (Calculated PathInfo)=%q\\n\", path[pos:])\n\n    // Expected Safe Behavior:\n    want := strings.Index(path, split) + len(split)\n    fmt.Printf(\"expected splitPos=%d\\n\", want)\n    fmt.Printf(\"expected orig[:]=%q\\n\", path[:want])\n}\n```\n\n2. Run the PoC:\n\n```console\ngo run poc.go\n```\n\n3. **Output:**\n\n```text\norig bytes=26\nlower bytes=30\nsplitPos=22\norig[:pos]=\"/\u023a\u023a\u023a\u023ashell.php.txt\"\norig[pos:]=\".php\"\nexpected splitPos=18\nexpected orig[:]=\"/\u023a\u023a\u023a\u023ashell.php\"\n```\n\nIn this example, FrankenPHP would identify `/\u023a\u023a\u023a\u023ashell.php.txt` as the PHP script to execute, ignoring the fact that the actual file extension in the file system might be `.txt`.\n\n### Impact*\n\nThis is a **Security Boundary Bypass** and **Path Confusion** vulnerability.\n\nIn setups where users can upload files (e.g., avatars, text files) that are stored within the document root or a reachable path, an attacker can upload a file containing malicious PHP code with a safe extension (e.g., `payload.txt`). By crafting a request with specific Unicode characters, the attacker can force FrankenPHP to calculate the `SCRIPT_FILENAME` as ending in `payload.txt`, while the request appears to contain `.php` to the internal router logic.\n\nThis results in the execution of non-PHP files as PHP scripts, leading to **Remote Code Execution (RCE)**.\n\n### **Patched Versions**\n\n* This issue is fixed in FrankenPHP version **1.11.2**.\n\n### **Workarounds**\n\n* Ensure that user-uploaded files are stored outside of the public document root.\n* Implement strict WAF rules to reject requests containing specific multi-byte Unicode characters in the URL path if an upgrade is not immediately possible.",
  "id": "GHSA-g966-83w7-6w38",
  "modified": "2026-02-12T22:07:57Z",
  "published": "2026-02-12T15:29:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/php/frankenphp/security/advisories/GHSA-g966-83w7-6w38"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-24895"
    },
    {
      "type": "WEB",
      "url": "https://github.com/php/frankenphp/commit/04fdc0c1e8fde94e2c1ad86217e962c88d27c53e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/php/frankenphp"
    },
    {
      "type": "WEB",
      "url": "https://github.com/php/frankenphp/releases/tag/v1.11.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ],
  "summary": "FrankenPHP\u0027s unicode case-folding length expansion causes incorrect split_path index (SCRIPT_NAME/PATH_INFO confusion) in FrankenPHP"
}