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En versiones anteriores a 2.9.0, 2.8.1, 2.7.2 y 2.6.4, la implementación de \"tf.raw_ops.QuantizeAndDequantizeV4Grad\" no comprueba completamente los argumentos de entrada. Esto resulta en un fallo de \"CHECK\" que puede usarse para desencadenar un ataque de denegación de servicio. Las versiones 2.9.0, 2.8.1, 2.7.2 y 2.6.4 contienen un parche para este 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