CVE-2026-75589

{
  "id": "CVE-2026-75589",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "published": "2026-08-19T08:17:13.970",
  "lastModified": "2026-10-27T12:10:00.343",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Net::OAuth versions before 0.33 for Perl check HMAC-SHA1, HMAC-SHA256 and PLAINTEXT signatures with a non-constant-time comparison in verify.\n\nEach of the three compares the signature carried in the message against the locally computed one with the eq operator, which returns as soon as the two strings differ. The time taken to reject a signature varies with the length of the matching prefix. RSA-SHA1 is not affected, as it verifies through the RSA key object rather than by comparing strings.\n\nA client that can submit messages and time the replies may recover a valid signature one byte at a time rather than searching the whole signature space. Under PLAINTEXT the value compared against is the signature key itself, so the search recovers consumer_secret and token_secret."
    },
    {
      "lang": "es",
      "value": "Las versiones de Net::OAuth anteriores a la 0.33 para Perl verifican las firmas HMAC-SHA1, HMAC-SHA256 y PLAINTEXT con una comparación de tiempo no constante en verify.\n\nCada una de las tres compara la firma contenida en el mensaje con la calculada localmente mediante el operador eq, el cual devuelve un resultado tan pronto como las dos cadenas difieren. El tiempo que se tarda en rechazar una firma varía con la longitud del prefijo coincidente. RSA-SHA1 no se ve afectado, ya que verifica a través del objeto de clave RSA en lugar de comparar cadenas.\n\nUn cliente que puede enviar mensajes y medir el tiempo de las respuestas puede recuperar una firma válida un byte a la vez en lugar de buscar en todo el espacio de firmas. Bajo PLAINTEXT, el valor con el que se compara es la propia clave de firma, por lo que la búsqueda recupera consumer_secret y token_secret."
    }
  ],
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "collectionURL": "https://cpan.org/modules",
          "packageName": "Net-OAuth",
          "modules": [
            "Net::OAuth"
          ],
          "programFiles": [
            "lib/Net/OAuth/SignatureMethod/HMAC_SHA1.pm",
            "lib/Net/OAuth/SignatureMethod/HMAC_SHA256.pm",
            "lib/Net/OAuth/SignatureMethod/PLAINTEXT.pm"
          ],
          "programRoutines": [
            {
              "name": "Net::OAuth::SignatureMethod::HMAC_SHA1::verify"
            },
            {
              "name": "Net::OAuth::SignatureMethod::HMAC_SHA256::verify"
            },
            {
              "name": "Net::OAuth::SignatureMethod::PLAINTEXT::verify"
            }
          ],
          "repo": "https://github.com/vurtdev/Net-OAuth",
          "packageURL": "pkg:cpan/Net-OAuth",
          "versions": [
            {
              "version": "0",
              "lessThan": "0.33",
              "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:N",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-26T19:43:43.373927Z",
          "id": "CVE-2026-75589",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-208"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/vurtdev/Net-OAuth/commit/a1a16b58add85668ef4fcda642a486ceed098eba.patch",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://github.com/vurtdev/Net-OAuth/security/advisories/GHSA-g8xr-69p3-gw56",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://metacpan.org/release/RRWO/Net-OAuth-0.33/changes",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/08/19/3",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ]
}