CVE-2026-57075

{
  "id": "CVE-2026-57075",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "published": "2026-07-16T22:17:43.447",
  "lastModified": "2026-10-24T20:10:00.137",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char lookup-table index in syck_base64dec.\n\nThe base64 decoder in the bundled libsyck indexes the 256-entry static table b64_xtable with a signed char, so any !!binary byte >= 0x80 sign-extends to a negative index and reads before the table. The decoder receives the raw bytes of any !!binary node, a standard YAML type not gated by $LoadBlessed or $LoadCode, so it is reached on the default Load path.\n\nAny caller that runs Load or LoadFile on an untrusted document containing a !!binary scalar with a high-bit byte triggers the read, and the value read can surface in the decoded result."
    },
    {
      "lang": "es",
      "value": "Las versiones de YAML::Syck anteriores a la 1.47 para Perl permiten una lectura fuera de límites a través de un índice de tabla de búsqueda de carácter con signo en syck_base64dec.\n\nEl decodificador base64 en la libsyck incluida indexa la tabla estática b64_xtable de 256 entradas con un carácter con signo, por lo que cualquier byte !!binary >= 0x80 extiende el signo a un índice negativo y lee antes de la tabla. El decodificador recibe los bytes sin procesar de cualquier nodo !!binary, un tipo YAML estándar no restringido por $LoadBlessed o $LoadCode, por lo que se alcanza en la ruta de carga predeterminada.\n\nCualquier llamador que ejecute Load o LoadFile en un documento no confiable que contenga un escalar !!binary con un byte de bit alto activa la lectura, y el valor leído puede aparecer en el resultado decodificado."
    }
  ],
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "vendor": "TODDR",
          "product": "YAML::Syck",
          "defaultStatus": "unaffected",
          "collectionURL": "https://cpan.org/modules",
          "packageName": "YAML-Syck",
          "programFiles": [
            "emitter.c"
          ],
          "programRoutines": [
            {
              "name": "syck_base64dec"
            }
          ],
          "repo": "https://github.com/toddr/YAML-Syck",
          "versions": [
            {
              "version": "0",
              "lessThan": "1.47",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-17T13:08:13.464133Z",
          "id": "CVE-2026-57075",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/toddr/YAML-Syck/commit/44c90a109ec3215ee7ce747bd11209835e123d8b.patch",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://metacpan.org/release/TODDR/YAML-Syck-1.47/changes",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/07/17/2",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ]
}