CVE-2026-4258

All versions of the package sjcl are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.

All versions of the package sjcl are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.

Todas las versiones del paquete sjcl son vulnerables a la Verificación Incorrecta de Firma Criptográfica debido a la falta de validación de punto en curva en sjcl.ecc.basicKey.publicKey(). Un atacante puede recuperar la clave privada ECDH de una víctima enviando claves públicas fuera de curva manipuladas y observando las salidas ECDH. La función dhJavaEc() devuelve directamente la coordenada x sin procesar del resultado de la multiplicación escalar (sin hashing), proporcionando un oráculo de texto plano sin requerir ninguna retroalimentación de descifrado.