CVE-2026-72889

{
  "id": "CVE-2026-72889",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "published": "2026-08-19T08:17:13.833",
  "lastModified": "2026-10-27T12:10:00.343",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify.\n\nverify resolves the signature method class from the signature_method parameter of the incoming message. signature_method is required on every request, so the algorithm used to check a signature is chosen by whoever sent it, and nothing lets the verifying party pin the method instead. When a message names HMAC-SHA1 or HMAC-SHA256, the key is derived from consumer_secret and token_secret rather than from the key the provider deployed.\n\nA provider deployed on RSA-SHA1 holds only the consumer public key, and RFC 5849 does not use consumer_secret for that method, so the required parameter is filled with a placeholder. A client that names HMAC-SHA1 instead has its signature checked against that placeholder, so a guessable one is enough to forge requests for any consumer key and token."
    },
    {
      "lang": "es",
      "value": "Las versiones de Net::OAuth anteriores a la 0.33 para Perl permiten al remitente elegir el algoritmo de firma en verify.\n\nverify resuelve la clase del método de firma a partir del parámetro signature_method del mensaje entrante. signature_method es requerido en cada solicitud, por lo que el algoritmo utilizado para verificar una firma es elegido por quien la envió, y nada permite a la parte verificadora fijar el método en su lugar. Cuando un mensaje nombra HMAC-SHA1 o HMAC-SHA256, la clave se deriva de consumer_secret y token_secret en lugar de la clave que el proveedor implementó.\n\nUn proveedor implementado en RSA-SHA1 solo posee la clave pública del consumidor, y RFC 5849 no utiliza consumer_secret para ese método, por lo que el parámetro requerido se rellena con un marcador de posición. Un cliente que nombra HMAC-SHA1 en su lugar tiene su firma verificada contra ese marcador de posición, por lo que uno adivinable es suficiente para falsificar solicitudes para cualquier clave de consumidor y token."
    }
  ],
  "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/Message.pm",
            "lib/Net/OAuth/Request.pm"
          ],
          "programRoutines": [
            {
              "name": "Net::OAuth::Message::verify"
            },
            {
              "name": "Net::OAuth::Message::_signature_method_class"
            },
            {
              "name": "Net::OAuth::Request::signature_key"
            }
          ],
          "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:H/A:H",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-26T18:02:49.745063Z",
          "id": "CVE-2026-72889",
          "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-347"
        },
        {
          "lang": "en",
          "value": "CWE-757"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://datatracker.ietf.org/doc/html/rfc5849#section-3.4.2",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://datatracker.ietf.org/doc/html/rfc5849#section-3.4.3",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://github.com/vurtdev/Net-OAuth/commit/c467adf45c8d77ac4b92ad78b3eebf949252ba7f.patch",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://github.com/vurtdev/Net-OAuth/security/advisories/GHSA-c8rm-g5cm-4pf5",
      "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/2026/08/19/2",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ]
}