CVE-2026-35554 (GCVE-0-2026-35554)

Vulnerability from cvelistv5 – Published: 2026-04-07 13:07 – Updated: 2026-04-07 16:23
VLAI
Title
Apache Kafka Clients: Kafka Producer Message Corruption and Misrouting via Buffer Pool Race Condition
Summary
A race condition in the Apache Kafka Java producer client’s buffer pool management can cause messages to be silently delivered to incorrect topics. When a produce batch expires due to delivery.timeout.ms while a network request containing that batch is still in flight, the batch’s ByteBuffer is prematurely deallocated and returned to the buffer pool. If a subsequent producer batch—potentially destined for a different topic—reuses this freed buffer before the original network request completes, the buffer contents may become corrupted. This can result in messages being delivered to unintended topics without any error being reported to the producer. Data Confidentiality: Messages intended for one topic may be delivered to a different topic, potentially exposing sensitive data to consumers who have access to the destination topic but not the intended source topic. Data Integrity: Consumers on the receiving topic may encounter unexpected or incompatible messages, leading to deserialization failures, processing errors, and corrupted downstream data. This issue affects Apache Kafka versions ≤ 3.9.1, ≤ 4.0.1, and  ≤ 4.1.1. Kafka users are advised to upgrade to 3.9.2, 4.0.2, 4.1.2, 4.2.0, or later to address this vulnerability.
Severity
8.7 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-07 13:57 UTC
CWE
  • CWE-416 - Use After Free
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
apache CNA under the mitre root
CNA scorecard B 76/100 over 1267 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Apache Software Foundation Apache Kafka Clients Affected: 2.8.0 , ≤ 3.9.1 (semver)
Affected: 4.0.0 , ≤ 4.0.1 (semver)
Affected: 4.1.0 , ≤ 4.1.1 (semver)
guessed Create a notification for this product.
Credits
Bharath Vissapragada <bharathv@apache.org> Donny Nadolny <donny.nadolny@hotmail.com> Donny Nadolny <donny.nadolny@hotmail.com>
Show details on NVD website
To clipboard 

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                  "value": "\u003cp\u003e\u003c/p\u003e\u003cp\u003eA race condition in the \u003cstrong\u003eApache Kafka Java producer client\u2019s buffer pool management\u003c/strong\u003e can cause messages to be silently delivered to incorrect topics.\u003c/p\u003e\u003cp\u003eWhen a produce batch expires due to \u003ccode\u003edelivery.timeout.ms\u003c/code\u003e while a network request containing that batch is still in flight, the batch\u2019s \u003ccode\u003eByteBuffer\u003c/code\u003e is prematurely deallocated and returned to the buffer pool. If a subsequent producer batch\u2014potentially destined for a different topic\u2014reuses this freed buffer before the original network request completes, the buffer contents may become corrupted. This can result in messages being delivered to unintended topics without any error being reported to the producer.\u003cbr\u003e\u003c/p\u003e\u003cp\u003e\u003cstrong\u003eData Confidentiality:\u003c/strong\u003e\u003cbr\u003eMessages intended for one topic may be delivered to a different topic, potentially exposing sensitive data to consumers who have access to the destination topic but not the intended source topic.\u003c/p\u003e\u003cp\u003e\u003cstrong\u003eData Integrity:\u003c/strong\u003e\u003cbr\u003eConsumers on the receiving topic may encounter unexpected or incompatible messages, leading to deserialization failures, processing errors, and corrupted downstream data.\u003c/p\u003e\u003cp\u003eThis issue affects \u003cstrong\u003eApache Kafka versions \u2264 3.9.1, \u2264 4.0.1, and\u0026nbsp; \u2264 4.1.1\u003c/strong\u003e.\u003c/p\u003e\u003cp\u003eKafka users are advised to upgrade to \u003cstrong\u003e3.9.2, 4.0.2, 4.1.2, 4.2.0, or later\u003c/strong\u003e to address this vulnerability.\u003c/p\u003e\u003cbr\u003e\u003cp\u003e\u003c/p\u003e"
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              "value": "A race condition in the Apache Kafka Java producer client\u2019s buffer pool management can cause messages to be silently delivered to incorrect topics.\n\nWhen a produce batch expires due to delivery.timeout.ms while a network request containing that batch is still in flight, the batch\u2019s ByteBuffer is prematurely deallocated and returned to the buffer pool. If a subsequent producer batch\u2014potentially destined for a different topic\u2014reuses this freed buffer before the original network request completes, the buffer contents may become corrupted. This can result in messages being delivered to unintended topics without any error being reported to the producer.\n\n\nData Confidentiality:\nMessages intended for one topic may be delivered to a different topic, potentially exposing sensitive data to consumers who have access to the destination topic but not the intended source topic.\n\nData Integrity:\nConsumers on the receiving topic may encounter unexpected or incompatible messages, leading to deserialization failures, processing errors, and corrupted downstream data.\n\nThis issue affects Apache Kafka versions \u2264 3.9.1, \u2264 4.0.1, and\u00a0 \u2264 4.1.1.\n\nKafka users are advised to upgrade to 3.9.2, 4.0.2, 4.1.2, 4.2.0, or later to address this vulnerability."
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          "metrics": [
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                "content": {
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          "problemTypes": [
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              "descriptions": [
                {
                  "cweId": "CWE-416",
                  "description": "CWE-416 Use After Free",
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              "descriptions": [
                {
                  "cweId": "CWE-362",
                  "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
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                  "type": "CWE"
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          "providerMetadata": {
            "dateUpdated": "2026-04-07T13:07:08.679Z",
            "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
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          "references": [
            {
              "tags": [
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              "url": "https://issues.apache.org/jira/browse/KAFKA-19012"
            },
            {
              "tags": [
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              ],
              "url": "https://lists.apache.org/thread/f07x7j8ovyqhjd1to25jsnqbm6wj01d6"
            }
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          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "Apache Kafka Clients: Kafka Producer Message Corruption and Misrouting via Buffer Pool Race Condition",
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      },
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        "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "assignerShortName": "apache",
        "cveId": "CVE-2026-35554",
        "datePublished": "2026-04-07T13:07:08.679Z",
        "dateReserved": "2026-04-03T11:08:30.442Z",
        "dateUpdated": "2026-04-07T16:23:31.521Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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