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CVE-2026-41564

Estado: AnalizadaAlta (7.5)—

CryptX versions before 0.088 for Perl do not reseed the Crypt::PK PRNG state after forking.

The 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.

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This affects preforking services such as the Starman web server, where a Crypt::PK::* object loaded at startup is inherited by every worker process.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:N, PR:N, UI:N indican acceso remoto sin privilegios (T1190). La reutilización de estado PRNG idéntico en procesos hijo permite recuperar claves privadas mediante nonce-reuse, exponiendo credenciales criptográficas (T1552.007) e interceptar comunicaciones (T1040).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Network SegmentationUser Account ManagementPrivileged Account ManagementLimit Access to Resource Over NetworkVulnerability ScanningMulti-factor Authentication

Tecnologías afectadas (1)

Dcit — Cryptx

CWE

Referencias

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{
  "id": "CVE-2026-41564",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "id": "CVE-2026-41564",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-23T13:05:18.115917Z"
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "version": "3.1",
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          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
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            "inc/CryptX_PK_ECC.xs.inc",
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  "weaknesses": [
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      "description": [
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          "value": "CWE-335"
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      "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."
    }
  ],
  "lastModified": "2026-06-17T10:46:51.377",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "versionEndExcluding": "0.088"
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          "operator": "OR"
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  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
}