{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-35554", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-04-03T11:08:30.442Z", "datePublished": "2026-04-07T13:07:08.679Z", "dateUpdated": "2026-04-07T16:23:31.521Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.kafka:kafka-clients", "product": "Apache Kafka Clients", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "3.9.1", "status": "affected", "version": "2.8.0", "versionType": "semver"}, {"lessThanOrEqual": "4.0.1", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThanOrEqual": "4.1.1", "status": "affected", "version": "4.1.0", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Bharath Vissapragada <bharathv@apache.org>"}, {"lang": "en", "type": "finder", "value": "Donny Nadolny <donny.nadolny@hotmail.com>"}, {"lang": "en", "type": "remediation developer", "value": "Donny Nadolny <donny.nadolny@hotmail.com>"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p></p><p>A race condition in the <strong>Apache Kafka Java producer client\u2019s buffer pool management</strong> can cause messages to be silently delivered to incorrect topics.</p><p>When a produce batch expires due to <code>delivery.timeout.ms</code> while a network request containing that batch is still in flight, the batch\u2019s <code>ByteBuffer</code> 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.<br></p><p><strong>Data Confidentiality:</strong><br>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.</p><p><strong>Data Integrity:</strong><br>Consumers on the receiving topic may encounter unexpected or incompatible messages, leading to deserialization failures, processing errors, and corrupted downstream data.</p><p>This issue affects <strong>Apache Kafka versions \u2264 3.9.1, \u2264 4.0.1, and&nbsp; \u2264 4.1.1</strong>.</p><p>Kafka users are advised to upgrade to <strong>3.9.2, 4.0.2, 4.1.2, 4.2.0, or later</strong> to address this vulnerability.</p><br><p></p>"}], "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."}], "metrics": [{"other": {"content": {"text": "moderate"}, "type": "Textual description of severity"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-416", "description": "CWE-416 Use After Free", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-362", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-04-07T13:07:08.679Z"}, "references": [{"tags": ["issue-tracking"], "url": "https://issues.apache.org/jira/browse/KAFKA-19012"}, {"tags": ["mailing-list", "vendor-advisory"], "url": "https://lists.apache.org/thread/f07x7j8ovyqhjd1to25jsnqbm6wj01d6"}], "source": {"discovery": "EXTERNAL"}, "title": "Apache Kafka Clients: Kafka Producer Message Corruption and Misrouting via Buffer Pool Race Condition", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.7, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-04-07T13:57:17.254124Z", "id": "CVE-2026-35554", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-07T13:58:08.252Z"}}, {"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/04/07/6"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-04-07T16:23:31.521Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/04/07/6"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-04-07T16:23:31.521Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.7, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-35554", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-07T13:57:17.254124Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-07T13:56:22.085Z"}}], "cna": {"title": "Apache Kafka Clients: Kafka Producer Message Corruption and Misrouting via Buffer Pool Race Condition", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "reporter", "value": "Bharath Vissapragada <bharathv@apache.org>"}, {"lang": "en", "type": "finder", "value": "Donny Nadolny <donny.nadolny@hotmail.com>"}, {"lang": "en", "type": "remediation developer", "value": "Donny Nadolny <donny.nadolny@hotmail.com>"}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "moderate"}}}], "affected": [{"vendor": "Apache Software Foundation", "product": "Apache Kafka Clients", "versions": [{"status": "affected", "version": "2.8.0", "versionType": "semver", "lessThanOrEqual": "3.9.1"}, {"status": "affected", "version": "4.0.0", "versionType": "semver", "lessThanOrEqual": "4.0.1"}, {"status": "affected", "version": "4.1.0", "versionType": "semver", "lessThanOrEqual": "4.1.1"}], "packageName": "org.apache.kafka:kafka-clients", "collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected"}], "references": [{"url": "https://issues.apache.org/jira/browse/KAFKA-19012", "tags": ["issue-tracking"]}, {"url": "https://lists.apache.org/thread/f07x7j8ovyqhjd1to25jsnqbm6wj01d6", "tags": ["mailing-list", "vendor-advisory"]}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "descriptions": [{"lang": "en", "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.", "supportingMedia": [{"type": "text/html", "value": "<p></p><p>A race condition in the <strong>Apache Kafka Java producer client\u2019s buffer pool management</strong> can cause messages to be silently delivered to incorrect topics.</p><p>When a produce batch expires due to <code>delivery.timeout.ms</code> while a network request containing that batch is still in flight, the batch\u2019s <code>ByteBuffer</code> 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.<br></p><p><strong>Data Confidentiality:</strong><br>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.</p><p><strong>Data Integrity:</strong><br>Consumers on the receiving topic may encounter unexpected or incompatible messages, leading to deserialization failures, processing errors, and corrupted downstream data.</p><p>This issue affects <strong>Apache Kafka versions \u2264 3.9.1, \u2264 4.0.1, and&nbsp; \u2264 4.1.1</strong>.</p><p>Kafka users are advised to upgrade to <strong>3.9.2, 4.0.2, 4.1.2, 4.2.0, or later</strong> to address this vulnerability.</p><br><p></p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-362", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-04-07T13:07:08.679Z"}}}, "cveMetadata": {"cveId": "CVE-2026-35554", "state": "PUBLISHED", "dateUpdated": "2026-04-07T16:23:31.521Z", "dateReserved": "2026-04-03T11:08:30.442Z", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "datePublished": "2026-04-07T13:07:08.679Z", "assignerShortName": "apache"}, "dataVersion": "5.2"}

{"cveTags": [], "descriptions": [{"lang": "en", "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."}], "id": "CVE-2026-35554", "lastModified": "2026-04-07T17:16:32.697", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.8, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-04-07T14:16:23.413", "references": [{"source": "security@apache.org", "url": "https://issues.apache.org/jira/browse/KAFKA-19012"}, {"source": "security@apache.org", "url": "https://lists.apache.org/thread/f07x7j8ovyqhjd1to25jsnqbm6wj01d6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/04/07/6"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}, {"lang": "en", "value": "CWE-416"}], "source": "security@apache.org", "type": "Secondary"}]}

{}