CVE-2025-61152

{
  "id": "CVE-2025-61152",
  "sourceIdentifier": "[email protected]",
  "published": "2025-10-10T14:15:43.360",
  "lastModified": "2026-11-05T22:10:00.203",
  "vulnStatus": "Deferred",
  "cveTags": [
    {
      "sourceIdentifier": "[email protected]",
      "tags": [
        "disputed"
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "python-jose thru 3.3.0 allows JWT tokens with 'alg=none' to be decoded and accepted without any cryptographic signature verification. A malicious actor can craft a forged token with arbitrary claims (e.g., is_admin=true) and bypass authentication checks, leading to privilege escalation or unauthorized access in applications that rely on python-jose for token validation. This issue is exploitable unless developers explicitly reject 'alg=none' tokens, which is not enforced by the library. NOTE: all parties agree that the issue is not relevant because it only occurs in a \"verify_signature\": False situation."
    },
    {
      "lang": "es",
      "value": "python-jose hasta la versión 3.3.0 permite que los tokens JWT con ’alg=none’ sean decodificados y aceptados sin ninguna verificación de firma criptográfica. Un actor malicioso puede crear un token falsificado con reclamaciones arbitrarias (por ejemplo, is_admin=true) y eludir las comprobaciones de autenticación, lo que lleva a una escalada de privilegios o acceso no autorizado en aplicaciones que dependen de python-jose para la validación de tokens. Este problema es explotable a menos que los desarrolladores rechacen explícitamente los tokens ’alg=none’, lo cual no es forzado por la biblioteca. NOTA: todas las partes están de acuerdo en que el problema no es relevante porque solo ocurre en una situación de ’verify_signature’: False."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "version": "n/a",
              "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:L/I:L/A:N",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2025-10-10T14:21:53.362493Z",
          "id": "CVE-2025-61152",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-269"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/javiermorales36/PoC-for-python-jose-alg-none-JWT-bypass-vulnerability/blob/main/CVE-2025-61152_Security_Advisory.md",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/mpdavis/python-jose/issues/391",
      "source": "[email protected]"
    },
    {
      "url": "https://pypi.org/project/python-jose",
      "source": "[email protected]"
    }
  ]
}