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.
Metrics
Affected Vendors & Products
| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-6p6v-m64v-jx8q | Apache Spark has Inadequate Encryption Strength |
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Tue, 04 Nov 2025 22:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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Mon, 20 Oct 2025 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:apache:spark:*:*:*:*:*:*:*:* |
Mon, 20 Oct 2025 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Apache
Apache spark |
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| Vendors & Products |
Apache
Apache spark |
Wed, 15 Oct 2025 20:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
cvssV3_1
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Wed, 15 Oct 2025 07:30:00 +0000
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|---|---|---|
| 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. | |
| Title | Apache Spark, Apache Spark: RPC encryption defaults to unauthenticated AES-CTR mode, enabling man-in-the-middle ciphertext modification attacks | |
| Weaknesses | CWE-326 CWE-347 |
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| References |
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Status: PUBLISHED
Assigner: apache
Published:
Updated: 2025-11-04T21:13:00.940Z
Reserved: 2025-08-06T00:27:38.654Z
Link: CVE-2025-55039
Updated: 2025-11-04T21:13:00.940Z
Status : Modified
Published: 2025-10-15T08:15:38.460
Modified: 2025-11-04T22:16:30.140
Link: CVE-2025-55039
No data.
OpenCVE Enrichment
Updated: 2025-10-20T13:26:46Z
Github GHSA