CVE-2025-55039 Apache Spark, Apache Spark: RPC encryption defaults to unauthenticated AES-CTR mode, enabling man-in-the-middle ciphertext modification attacks

This issue affects Apache Spark versions before 3.4.4, 3.5.2 and 4.0.0. Apache Spark versions before 4.0.0, 3.5.2 and 3.4.4 use an insecure default network encryption cipher for RPC communication between nodes. When spark.network.crypto.enabled is set to true it is set to false by default, but...

CVE-2025-55039

CVE-2025-55039 affects Apache Spark prior to 3.4.4, 3.5.2 and 4.0.0. When spark.network.crypto.enabled is true (default false) and spark.network.crypto.cipher is not configured, Spark uses AES/CTR/NoPadding for RPC traffic, enabling encryption without authentication. A MITM could flip bits in cip...