CVE-2026-45728

{
  "id": "CVE-2026-45728",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-45728",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-26T17:31:16.231606Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "xyproto",
          "product": "algernon",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.17.7"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-05-26T17:16:47.900",
  "references": [
    {
      "url": "https://github.com/xyproto/algernon/security/advisories/GHSA-fwqx-8365-9983",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/xyproto/algernon/security/advisories/GHSA-fwqx-8365-9983",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-209"
        },
        {
          "lang": "en",
          "value": "CWE-489"
        },
        {
          "lang": "en",
          "value": "CWE-540"
        },
        {
          "lang": "en",
          "value": "CWE-1188"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, when Algernon is invoked with a single file path instead of a directory, singleFileMode is set to true and debugMode is forcibly enabled. debugMode activates the PrettyError renderer, which on any Lua or template error response dumps the absolute path of the file that errored, complete byte contents of that file, and exception or parser error text. This response is served with HTTP 200 OK to whoever sent the request that triggered the error. Any client able to reach the server and able to provoke a runtime error in the served script obtains the full server-side source of that script and of any sibling Lua data file consulted during the request. This vulnerability is fixed in 1.17.7."
    },
    {
      "lang": "es",
      "value": "Algernon es un pequeño servidor web autónomo y puro Go. Antes de la versión 1.17.7, cuando Algernon se invoca con una única ruta de archivo en lugar de un directorio, singleFileMode se establece en true y debugMode se habilita forzosamente. debugMode activa el renderizador PrettyError, que ante cualquier respuesta de error de Lua o de plantilla, vuelca la ruta absoluta del archivo que causó el error, el contenido completo en bytes de ese archivo y el texto del error de excepción o del analizador. Esta respuesta se sirve con HTTP 200 OK a quienquiera que haya enviado la solicitud que desencadenó el error. Cualquier cliente capaz de alcanzar el servidor y de provocar un error en tiempo de ejecución en el script servido obtiene la fuente completa del lado del servidor de ese script y de cualquier archivo de datos Lua hermano consultado durante la solicitud. Esta vulnerabilidad se corrige en la versión 1.17.7."
    }
  ],
  "lastModified": "2026-07-24T11:10:00.170",
  "sourceIdentifier": "security-advisories@github.com"
}