CVE-2026-41564

{
  "id": "CVE-2026-41564",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "published": "2026-04-23T08:16:01.243",
  "lastModified": "2026-10-26T22:10:00.163",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "CryptX versions before 0.088 for Perl do not reseed the Crypt::PK PRNG state after forking.\n\nThe Crypt::PK::RSA, Crypt::PK::DSA, Crypt::PK::DH, Crypt::PK::ECC, Crypt::PK::Ed25519 and Crypt::PK::X25519 modules seed a per-object PRNG state in their constructors and reuse it without fork detection. A Crypt::PK::* object created before `fork()` shares byte-identical PRNG state with every child process, and any randomized operation they perform can produce identical output, including key generation. Two ECDSA or DSA signatures from different processes are enough to recover the signing private key through nonce-reuse key recovery.\n\nThis affects preforking services such as the Starman web server, where a Crypt::PK::* object loaded at startup is inherited by every worker process."
    },
    {
      "lang": "es",
      "value": "Las versiones de CryptX anteriores a la 0.088 para Perl no reinicializan el estado del PRNG de Crypt::PK después de la bifurcación.\n\nLos módulos Crypt::PK::RSA, Crypt::PK::DSA, Crypt::PK::DH, Crypt::PK::ECC, Crypt::PK::Ed25519 y Crypt::PK::X25519 inicializan un estado de PRNG por objeto en sus constructores y lo reutilizan sin detección de bifurcación. Un objeto Crypt::PK::* creado antes de ’fork()’ comparte un estado de PRNG idéntico byte a byte con cada proceso hijo, y cualquier operación aleatoria que realicen puede producir una salida idéntica, incluida la generación de claves. Dos firmas ECDSA o DSA de procesos diferentes son suficientes para recuperar la clave privada de firma mediante la recuperación de claves por reutilización de ’nonce’.\n\nEsto afecta a los servicios de pre-bifurcación, como el servidor web Starman, donde un objeto Crypt::PK::* cargado al inicio es heredado por cada proceso trabajador."
    }
  ],
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "vendor": "MIK",
          "product": "CryptX",
          "defaultStatus": "unaffected",
          "collectionURL": "https://cpan.org/modules",
          "packageName": "CryptX",
          "programFiles": [
            "inc/CryptX_PK_RSA.xs.inc",
            "inc/CryptX_PK_DSA.xs.inc",
            "inc/CryptX_PK_DH.xs.inc",
            "inc/CryptX_PK_ECC.xs.inc",
            "inc/CryptX_PK_Ed25519.xs.inc",
            "inc/CryptX_PK_X25519.xs.inc"
          ],
          "repo": "https://github.com/DCIT/perl-CryptX",
          "versions": [
            {
              "version": "0",
              "lessThan": "0.088",
              "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": "2026-04-23T13:05:18.115917Z",
          "id": "CVE-2026-41564",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "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-335"
        },
        {
          "lang": "en",
          "value": "CWE-338"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:dcit:cryptx:*:*:*:*:*:perl:*:*",
              "versionEndExcluding": "0.088",
              "matchCriteriaId": "867C8CA7-DE4B-4FA3-9463-54005255A432"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/DCIT/perl-CryptX/commit/9a1dd3e0c27d68e32450be5538b864c2b115ee15.patch",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/DCIT/perl-CryptX/security/advisories/GHSA-24c2-gp6c-24c6",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://metacpan.org/release/MIK/CryptX-0.088",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Product"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/04/23/2",
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://github.com/DCIT/perl-CryptX/security/advisories/GHSA-24c2-gp6c-24c6",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}