CVE-2026-112375

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An IncrementalAlterConfigs (or AlterConfigs) request targeting a BROKER resource\u00a0reaches the broker's configuration validation before any authorization check is applied to\u00a0that path. Validation resolves configuration variables such as ${file:/path:key} or ${env:VAR}\u00a0using a ConfigProvider named in the request, and this resolution bypasses the\u00a0org.apache.kafka.automatic.config.providers allowlist that was added as the mitigation for\u00a0CVE-2024-31141. An arbitrary ConfigProvider (for example FileConfigProvider or\u00a0EnvVarConfigProvider) is therefore instantiated and the referenced file or environment\u00a0variable is read, and a type-validation error returns the resolved content to the caller.\n\n\nImpact:\n\nOn a cluster with an authorizer enabled, an authenticated principal with no authorization\u00a0grants can read the contents of files accessible to the broker process, and the broker's\u00a0environment variables, exposing credentials, keystores, or other secrets, defeating the\u00a0CVE-2024-31141 allowlist. The read is bounded by the broker process's file permissions. The\u00a0brokers and the cluster remain available; the issue is disclosure of file and environment-\u00a0variable contents. Clusters with no authorizer configured are not affected in practice,\u00a0because every principal already holds ALTER_CONFIGS there.\n\n\nMitigation:\n\nUpgrade to Apache Kafka 4.2.2, 4.3.2, or 4.4.0. As defense in depth, run brokers under a\u00a0least-privileged operating-system account so that sensitive files are not readable by the\u00a0broker process.\n\n\nResolution:\n\nFrom Apache Kafka 4.2.2, 4.3.2, and 4.4.0: broker configuration changes are authorized\u00a0(ALTER_CONFIGS on the cluster) before the configuration is validated, and configuration-\u00a0variable resolution enforces the config-providers allowlist.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div>An authenticated Kafka principal with no authorization grants (not even ALTER_CONFIGS) can&nbsp;<span>make a broker read a file or an environment variable from the broker host and return its&nbsp;</span><span>contents. An IncrementalAlterConfigs (or AlterConfigs) request targeting a BROKER resource&nbsp;</span><span>reaches the broker's configuration validation before any authorization check is applied to&nbsp;</span><span>that path. Validation resolves configuration variables such as ${file:/path:key} or ${env:VAR}&nbsp;</span><span>using a ConfigProvider named in the request, and this resolution bypasses the&nbsp;</span><span>org.apache.kafka.automatic.config.providers allowlist that was added as the mitigation for&nbsp;</span><span>CVE-2024-31141. An arbitrary ConfigProvider (for example FileConfigProvider or&nbsp;</span><span>EnvVarConfigProvider) is therefore instantiated and the referenced file or environment&nbsp;</span><span>variable is read, and a type-validation error returns the resolved content to the caller.</span></div><br><div>Impact:</div><div>On a cluster with an authorizer enabled, an authenticated principal with no authorization&nbsp;<span>grants can read the contents of files accessible to the broker process, and the broker's&nbsp;</span><span>environment variables, exposing credentials, keystores, or other secrets, defeating the&nbsp;</span><span>CVE-2024-31141 allowlist. The read is bounded by the broker process's file permissions. The&nbsp;</span><span>brokers and the cluster remain available; the issue is disclosure of file and environment-&nbsp;</span><span>variable contents. Clusters with no authorizer configured are not affected in practice,&nbsp;</span><span>because every principal already holds ALTER_CONFIGS there.</span></div><br><div>Mitigation:</div><div>Upgrade to Apache Kafka 4.2.2, 4.3.2, or 4.4.0. As defense in depth, run brokers under a&nbsp;<span>least-privileged operating-system account so that sensitive files are not readable by the&nbsp;</span><span>broker process.</span></div><br><div>Resolution:</div><div>From Apache Kafka 4.2.2, 4.3.2, and 4.4.0: broker configuration changes are authorized&nbsp;<span>(ALTER_CONFIGS on the cluster) before the configuration is validated, and configuration-&nbsp;</span><span>variable resolution enforces the config-providers allowlist.</span></div>"}]}], "references": [{"url": "https://kafka.apache.org/cve-list", "tags": ["vendor-advisory"]}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "important"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "credits": [{"lang": "en", "value": "Arthur Chan <arthur.chan@adalogics.com>, Ada Logics and Anthropic Research", "type": "reporter"}, {"lang": "en", "value": "OpenAI Codex Security - Amy Burnett and Khai Tran", "type": "reporter"}, {"lang": "en", "value": "Mickael Maison <mickael.maison@gmail.com>", "type": "remediation developer"}, {"lang": "en", "value": "Manikumar Reddy <manikumar.reddy@gmail.com>", "type": "remediation developer"}, {"lang": "en", "value": "Chia-Ping Tsai <chia7712@gmail.com>", "type": "remediation developer"}], "x_generator": {"engine": "Vulnogram 1.0.3"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-11-05T17:26:46.994062Z", "id": "CVE-2026-112375", "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": "2026-11-05T17:26:53.450Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-112375", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-05T17:26:46.994062Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-05T17:26:10.623Z"}}], "cna": {"title": "Apache Kafka: Unauthorized principal can read arbitrary broker files via IncrementalAlterConfigs", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "reporter", "value": "Arthur Chan <arthur.chan@adalogics.com>, Ada Logics and Anthropic Research"}, {"lang": "en", "type": "reporter", "value": "OpenAI Codex Security - Amy Burnett and Khai Tran"}, {"lang": "en", "type": "remediation developer", "value": "Mickael Maison <mickael.maison@gmail.com>"}, {"lang": "en", "type": "remediation developer", "value": "Manikumar Reddy <manikumar.reddy@gmail.com>"}, {"lang": "en", "type": "remediation developer", "value": "Chia-Ping Tsai <chia7712@gmail.com>"}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "important"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Apache Software Foundation", "product": "Apache Kafka", "versions": [{"status": "affected", "version": "3.2.0", "versionType": "semver", "lessThanOrEqual": "4.1.2"}, {"status": "affected", "version": "4.2.0", "versionType": "semver", "lessThanOrEqual": "4.2.1"}, {"status": "affected", "version": "4.3.0", "versionType": "semver", "lessThanOrEqual": "4.3.1"}], "packageURL": "pkg:maven/org.apache.kafka/kafka", "packageName": "org.apache.kafka:kafka", "collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected"}], "references": [{"url": "https://kafka.apache.org/cve-list", "tags": ["vendor-advisory"]}], "x_generator": {"engine": "Vulnogram 1.0.3"}, "descriptions": [{"lang": "en", "value": "An authenticated Kafka principal with no authorization grants (not even ALTER_CONFIGS) can\u00a0make a broker read a file or an environment variable from the broker host and return its\u00a0contents. An IncrementalAlterConfigs (or AlterConfigs) request targeting a BROKER resource\u00a0reaches the broker's configuration validation before any authorization check is applied to\u00a0that path. Validation resolves configuration variables such as ${file:/path:key} or ${env:VAR}\u00a0using a ConfigProvider named in the request, and this resolution bypasses the\u00a0org.apache.kafka.automatic.config.providers allowlist that was added as the mitigation for\u00a0CVE-2024-31141. An arbitrary ConfigProvider (for example FileConfigProvider or\u00a0EnvVarConfigProvider) is therefore instantiated and the referenced file or environment\u00a0variable is read, and a type-validation error returns the resolved content to the caller.\n\n\nImpact:\n\nOn a cluster with an authorizer enabled, an authenticated principal with no authorization\u00a0grants can read the contents of files accessible to the broker process, and the broker's\u00a0environment variables, exposing credentials, keystores, or other secrets, defeating the\u00a0CVE-2024-31141 allowlist. The read is bounded by the broker process's file permissions. The\u00a0brokers and the cluster remain available; the issue is disclosure of file and environment-\u00a0variable contents. Clusters with no authorizer configured are not affected in practice,\u00a0because every principal already holds ALTER_CONFIGS there.\n\n\nMitigation:\n\nUpgrade to Apache Kafka 4.2.2, 4.3.2, or 4.4.0. As defense in depth, run brokers under a\u00a0least-privileged operating-system account so that sensitive files are not readable by the\u00a0broker process.\n\n\nResolution:\n\nFrom Apache Kafka 4.2.2, 4.3.2, and 4.4.0: broker configuration changes are authorized\u00a0(ALTER_CONFIGS on the cluster) before the configuration is validated, and configuration-\u00a0variable resolution enforces the config-providers allowlist.", "supportingMedia": [{"type": "text/html", "value": "<div>An authenticated Kafka principal with no authorization grants (not even ALTER_CONFIGS) can&nbsp;<span>make a broker read a file or an environment variable from the broker host and return its&nbsp;</span><span>contents. An IncrementalAlterConfigs (or AlterConfigs) request targeting a BROKER resource&nbsp;</span><span>reaches the broker's configuration validation before any authorization check is applied to&nbsp;</span><span>that path. Validation resolves configuration variables such as ${file:/path:key} or ${env:VAR}&nbsp;</span><span>using a ConfigProvider named in the request, and this resolution bypasses the&nbsp;</span><span>org.apache.kafka.automatic.config.providers allowlist that was added as the mitigation for&nbsp;</span><span>CVE-2024-31141. An arbitrary ConfigProvider (for example FileConfigProvider or&nbsp;</span><span>EnvVarConfigProvider) is therefore instantiated and the referenced file or environment&nbsp;</span><span>variable is read, and a type-validation error returns the resolved content to the caller.</span></div><br><div>Impact:</div><div>On a cluster with an authorizer enabled, an authenticated principal with no authorization&nbsp;<span>grants can read the contents of files accessible to the broker process, and the broker's&nbsp;</span><span>environment variables, exposing credentials, keystores, or other secrets, defeating the&nbsp;</span><span>CVE-2024-31141 allowlist. The read is bounded by the broker process's file permissions. The&nbsp;</span><span>brokers and the cluster remain available; the issue is disclosure of file and environment-&nbsp;</span><span>variable contents. Clusters with no authorizer configured are not affected in practice,&nbsp;</span><span>because every principal already holds ALTER_CONFIGS there.</span></div><br><div>Mitigation:</div><div>Upgrade to Apache Kafka 4.2.2, 4.3.2, or 4.4.0. As defense in depth, run brokers under a&nbsp;<span>least-privileged operating-system account so that sensitive files are not readable by the&nbsp;</span><span>broker process.</span></div><br><div>Resolution:</div><div>From Apache Kafka 4.2.2, 4.3.2, and 4.4.0: broker configuration changes are authorized&nbsp;<span>(ALTER_CONFIGS on the cluster) before the configuration is validated, and configuration-&nbsp;</span><span>variable resolution enforces the config-providers allowlist.</span></div>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-862", "description": "CWE-862 Missing Authorization"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-10-28T16:46:38.006Z"}}}, "cveMetadata": {"cveId": "CVE-2026-112375", "state": "PUBLISHED", "dateUpdated": "2026-11-05T17:26:53.450Z", "dateReserved": "2026-10-19T16:21:36.477Z", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "datePublished": "2026-10-28T16:46:38.006Z", "assignerShortName": "apache"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.kafka:kafka", "packageURL": "pkg:maven/org.apache.kafka/kafka", "product": "Apache Kafka", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "4.1.2", "status": "affected", "version": "3.2.0", "versionType": "semver"}, {"lessThanOrEqual": "4.2.1", "status": "affected", "version": "4.2.0", "versionType": "semver"}, {"lessThanOrEqual": "4.3.1", "status": "affected", "version": "4.3.0", "versionType": "semver"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An authenticated Kafka principal with no authorization grants (not even ALTER_CONFIGS) can\u00a0make a broker read a file or an environment variable from the broker host and return its\u00a0contents. An IncrementalAlterConfigs (or AlterConfigs) request targeting a BROKER resource\u00a0reaches the broker's configuration validation before any authorization check is applied to\u00a0that path. Validation resolves configuration variables such as ${file:/path:key} or ${env:VAR}\u00a0using a ConfigProvider named in the request, and this resolution bypasses the\u00a0org.apache.kafka.automatic.config.providers allowlist that was added as the mitigation for\u00a0CVE-2024-31141. An arbitrary ConfigProvider (for example FileConfigProvider or\u00a0EnvVarConfigProvider) is therefore instantiated and the referenced file or environment\u00a0variable is read, and a type-validation error returns the resolved content to the caller.\n\n\nImpact:\n\nOn a cluster with an authorizer enabled, an authenticated principal with no authorization\u00a0grants can read the contents of files accessible to the broker process, and the broker's\u00a0environment variables, exposing credentials, keystores, or other secrets, defeating the\u00a0CVE-2024-31141 allowlist. The read is bounded by the broker process's file permissions. The\u00a0brokers and the cluster remain available; the issue is disclosure of file and environment-\u00a0variable contents. Clusters with no authorizer configured are not affected in practice,\u00a0because every principal already holds ALTER_CONFIGS there.\n\n\nMitigation:\n\nUpgrade to Apache Kafka 4.2.2, 4.3.2, or 4.4.0. As defense in depth, run brokers under a\u00a0least-privileged operating-system account so that sensitive files are not readable by the\u00a0broker process.\n\n\nResolution:\n\nFrom Apache Kafka 4.2.2, 4.3.2, and 4.4.0: broker configuration changes are authorized\u00a0(ALTER_CONFIGS on the cluster) before the configuration is validated, and configuration-\u00a0variable resolution enforces the config-providers allowlist."}], "id": "CVE-2026-112375", "lastModified": "2026-11-05T18:17:01.130", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-112375", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T17:26:46.994062Z", "version": "2.0.3"}}]}, "published": "2026-10-28T17:17:42.760", "references": [{"source": "security@apache.org", "url": "https://kafka.apache.org/cve-list"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-862"}], "source": "security@apache.org", "type": "Secondary"}]}

{"bugzilla": {"description": "kafka: kafka: Information disclosure via unauthorized broker configuration validation", "id": "2562995", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562995"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-209", "details": ["An authenticated Kafka principal with no authorization grants (not even ALTER_CONFIGS) can\u00a0make a broker read a file or an environment variable from the broker host and return its\u00a0contents. An IncrementalAlterConfigs (or AlterConfigs) request targeting a BROKER resource\u00a0reaches the broker's configuration validation before any authorization check is applied to\u00a0that path. Validation resolves configuration variables such as ${file:/path:key} or ${env:VAR}\u00a0using a ConfigProvider named in the request, and this resolution bypasses the\u00a0org.apache.kafka.automatic.config.providers allowlist that was added as the mitigation for\u00a0CVE-2024-31141. An arbitrary ConfigProvider (for example FileConfigProvider or\u00a0EnvVarConfigProvider) is therefore instantiated and the referenced file or environment\u00a0variable is read, and a type-validation error returns the resolved content to the caller.\nImpact:\nOn a cluster with an authorizer enabled, an authenticated principal with no authorization\u00a0grants can read the contents of files accessible to the broker process, and the broker's\u00a0environment variables, exposing credentials, keystores, or other secrets, defeating the\u00a0CVE-2024-31141 allowlist. The read is bounded by the broker process's file permissions. The\u00a0brokers and the cluster remain available; the issue is disclosure of file and environment-\u00a0variable contents. Clusters with no authorizer configured are not affected in practice,\u00a0because every principal already holds ALTER_CONFIGS there.\nMitigation:\nUpgrade to Apache Kafka 4.2.2, 4.3.2, or 4.4.0. As defense in depth, run brokers under a\u00a0least-privileged operating-system account so that sensitive files are not readable by the\u00a0broker process.\nResolution:\nFrom Apache Kafka 4.2.2, 4.3.2, and 4.4.0: broker configuration changes are authorized\u00a0(ALTER_CONFIGS on the cluster) before the configuration is validated, and configuration-\u00a0variable resolution enforces the config-providers allowlist.", "A flaw was found in Apache Kafka. Broker configuration update requests are validated before authorization checks are performed, allowing arbitrary configuration providers to resolve variables and bypass security controls. An authenticated user without authorization privileges can exploit this flaw by sending a crafted configuration request, causing the broker host to read local files or environment variables and return their contents in error responses. This can lead to information disclosure of sensitive system data, including credentials and keystores."], "name": "CVE-2026-112375", "public_date": "2026-10-28T16:46:38Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-112375\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-112375\nhttps://kafka.apache.org/cve-list"], "statement": "This vulnerability is rated as Moderate severity because exploitation requires an attacker to possess valid credentials to authenticate to the Kafka cluster, even though specific authorization grants are not needed. Successful exploitation is limited to unauthorized information disclosure of files and environment variables accessible to the broker service account, without permitting remote code execution, cluster manipulation, or denial of service. Red Hat products deploying Apache Kafka run broker processes under dedicated, least-privileged service accounts, restricting the scope of readable host files.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.2.0,4.1.2]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.2.0,4.2.1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.3.0,4.3.1]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Apache Kafka", "source": "cna", "vendor": "Apache Software Foundation"}, "product": "kafka", "vendor": "apache"}], "created": "2026-10-28T18:30:15.306241+00:00", "updated": "2026-11-06T01:30:10.874137+00:00", "vendors": ["apache", "apache$PRODUCT$kafka"]}