CVE-2026-45135

{
  "id": "CVE-2026-45135",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-23T18:17:52.343",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Caddy is an extensible server platform that uses TLS by default. From 2.7.0 until 2.11.3, the FastCGI transport's splitPos() in modules/caddyhttp/reverseproxy/fastcgi/fastcgi.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 Caddy's FastCGI splitting into treating a non-.php (or other configured split_path extension) file as a script. In any deployment where the attacker can place content into a file served via FastCGI (uploads, file storage, etc.), this can be escalated to remote code execution by crafting a URL whose path triggers either flaw. This vulnerability is fixed in 2.11.3."
    },
    {
      "lang": "es",
      "value": "Caddy es una plataforma de servidor extensible que usa TLS por defecto. Desde la 2.7.0 hasta la 2.11.3, la función splitPos() del transporte FastCGI en modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go hace un uso incorrecto de golang.org/x/text/search con search.IgnoreCase cuando la ruta de la solicitud contiene un byte no ASCII. Dos fallos distintos en esa alternativa permiten a un atacante engañar la división FastCGI de Caddy para que trate un archivo que no es .php (u otra extensión de split_path configurada) como un script. En cualquier despliegue donde el atacante pueda colocar contenido en un archivo servido a través de FastCGI (cargas, almacenamiento de archivos, etc.), esto puede escalarse a ejecución remota de código al crear una URL cuya ruta active cualquiera de los fallos. Esta vulnerabilidad está corregida en la 2.11.3."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "caddyserver",
          "product": "caddy",
          "versions": [
            {
              "version": ">= 2.7.0, < 2.11.3",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-23T18:30:00.592778Z",
          "id": "CVE-2026-45135",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        },
        {
          "lang": "en",
          "value": "CWE-176"
        },
        {
          "lang": "en",
          "value": "CWE-178"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:caddyserver:caddy:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "2.7.0",
              "versionEndExcluding": "2.11.3",
              "matchCriteriaId": "929EBC65-CE84-403E-BF54-03AA66C3B09E"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/caddyserver/caddy/security/advisories/GHSA-m675-2p33-xv9g",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/caddyserver/caddy/security/advisories/GHSA-m675-2p33-xv9g",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    }
  ]
}