Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-04-07 13:07 – Updated: 2026-04-07 16:23

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 ?

No CVSS data available.

CWE

CWE-416 - Use After Free
CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

apache

References

URL

Tags

	https://issues.apache.org/jira/browse/KAFKA-19012	issue-tracking
	https://lists.apache.org/thread/f07x7j8ovyqhjd1to…	mailing-listvendor-advisory

Impacted products

	Vendor	Product	Version
	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)

Credits

Bharath Vissapragada <bharathv@apache.org> Donny Nadolny <donny.nadolny@hotmail.com> Donny Nadolny <donny.nadolny@hotmail.com>

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-35554

Vulnerability from fkie_nvd - Published: 2026-04-07 14:16 - Updated: 2026-04-08 21:27

Severity ?

8.7 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Summary

References

	URL	Tags
	security@apache.org	https://issues.apache.org/jira/browse/KAFKA-19012
	security@apache.org	https://lists.apache.org/thread/f07x7j8ovyqhjd1to25jsnqbm6wj01d6
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/04/07/6

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-5QCV-4RPC-JP93

Vulnerability from github – Published: 2026-04-07 15:30 – Updated: 2026-04-07 18:31

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-35554"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-07T14:16:23Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-5qcv-4rpc-jp93",
  "modified": "2026-04-07T18:31:34Z",
  "published": "2026-04-07T15:30:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35554"
    },
    {
      "type": "WEB",
      "url": "https://issues.apache.org/jira/browse/KAFKA-19012"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/f07x7j8ovyqhjd1to25jsnqbm6wj01d6"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/04/07/6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

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

FKIE_CVE-2026-35554

GHSA-5QCV-4RPC-JP93

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Sightings

Nomenclature