CVEvulnerability

CVE-2025-55039

6.5 MEDIUM Published 2025-10-15 Modified 2026-10-08 Official page ↗
Status
Modified
Published
2025-10-15
Last modified
2026-10-08
Assigner
[email protected]
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-326, CWE-347

Description

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 spark.network.crypto.cipher is not explicitly configured, Spark defaults to AES in CTR mode (AES/CTR/NoPadding), which provides encryption without authentication. This vulnerability allows a man-in-the-middle attacker to modify encrypted RPC traffic undetected by flipping bits in ciphertext, potentially compromising heartbeat messages or application data and affecting the integrity of Spark workflows. To mitigate this issue, users should either configure spark.network.crypto.cipher to AES/GCM/NoPadding to enable authenticated encryption or enable SSL encryption by setting spark.ssl.enabled to true, which provides stronger transport security.

Affected configurations

• apache spark (< 3.4.4) • apache spark (>= 3.5.0 < 3.5.2)

Related

Weakness · CWE (2)

  • CWE-326 Inadequate Encryption Strength weakness
  • CWE-347 Improper Verification of Cryptographic Signature weakness

References