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CVE-2026-4599

Estado: ModificadaCrítica (9.3)—

Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to Incomplete Comparison with Missing Factors via the getRandomBigIntegerZeroToMax and getRandomBigIntegerMinToMax functions in src/crypto-1.1.js; an attacker can recover the private key by exploiting the incorrect compareTo checks that accept out-of-range candidates and thus bias DSA nonces during signature generation.

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.

Vulnerabilidad de comparación incompleta en funciones criptográficas expuestas en librería NPM (T1190). Permite recuperar clave privada DSA explotando sesgos en nonces de firma (T1552.007: credenciales criptográficas). CWE-338 confirma generación débil de números aleatorios.

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)

Kjur — Jsrsasign

CWE

Referencias

JSON original (NVD)

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      "value": "Versiones del paquete jsrsasign desde la 7.0.0 y hasta la 11.1.1 son vulnerables a Comparación Incompleta con Factores Faltantes a través de las funciones getRandomBigIntegerZeroToMax y getRandomBigIntegerMinToMax en src/crypto-1.1.js; un atacante puede recuperar la clave privada explotando las comprobaciones compareTo incorrectas que aceptan candidatos fuera de rango y, por lo tanto, sesgan los nonces DSA durante la generación de firmas."
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  "lastModified": "2026-09-10T13:20:21.650",
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