CVE-2026-15911

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-15911", "assignerOrgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "state": "PUBLISHED", "assignerShortName": "ibm", "dateReserved": "2026-07-15T19:28:12.162Z", "datePublished": "2026-10-01T18:29:42.297Z", "dateUpdated": "2026-10-06T02:01:13.972Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "shortName": "ibm", "dateUpdated": "2026-10-01T18:29:42.297Z"}, "title": "Confluent Kafka Python Improper TLS Certificate Validation", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-295", "description": "CWE-295 Improper certificate validation", "type": "CWE"}]}], "affected": [{"vendor": "confluent", "product": "confluent-kafka", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "2.14.2", "versionType": "semver"}], "defaultStatus": "unaffected", "cpes": ["cpe:2.3:a:confluent:confluent-kafka:*:*:*:*:*:*:*:*", "cpe:2.3:a:confluent:confluent-kafka:2.14.2:*:*:*:*:*:*:*"]}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:confluent:confluent-kafka:*:*:*:*:*:*:*:*", "versionStartIncluding": "0", "versionEndIncluding": "2.14.2"}]}]}], "descriptions": [{"lang": "en", "value": "Confluent Kafka Python client's HashiCorp Vault KMS integration could allow a remote attacker to obtain sensitive information due to improper TLS certificate validation.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Confluent Kafka Python client's HashiCorp Vault KMS integration could allow a remote attacker to obtain sensitive information due to improper TLS certificate validation."}]}], "references": [{"url": "https://support.confluent.io/hc/en-us/articles/54133146724244-CONFSA-2026-22-CVE-2026-15911-Confluent-Kafka-Python-Client-Vulnerability-TLS-Certificate-verification-disabled-by-default-in-HashiCorp-Vault-KMS-Integration", "tags": ["vendor-advisory", "patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE", "baseSeverity": "HIGH", "baseScore": 7.4, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"}}], "solutions": [{"lang": "en", "value": "* confluent-kafka (Python): This issue has been addressed in confluent-kafka (Python) 2.15.0, which: * Enables TLS certificate verification by default.\n * Exposes configuration to supply a custom CA bundle and an optional client certificate for mutual TLS, through both driver configuration and standard Vault environment variables: * ssl.ca.location (or environment variable VAULT_CACERT): CA bundle used to verify the Vault server certificate.\n * ssl.certificate.location (or environment variable VAULT_CLIENT_CERT): client certificate for mutual TLS.\n * ssl.key.location (or environment variable VAULT_CLIENT_KEY): client private key for mutual TLS.\n\n\n\n * An empty or unset CA value keeps verification enabled; it does not silently disable verification.\n\n\n\n * Confluent Platform: Not affected. The vulnerability resides in the confluent-kafka Python client library and does not affect Confluent Platform server components or their released versions.\n * Confluent Cloud: Not affected. No remediation is required for Confluent Cloud.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<ul><li><strong>confluent-kafka (Python): </strong>This issue has been addressed in confluent-kafka (Python) 2.15.0, which:<ul><li>Enables TLS certificate verification by default.</li><li>Exposes configuration to supply a custom CA bundle and an optional client certificate for mutual TLS, through both driver configuration and standard Vault environment variables:<ul><li>ssl.ca.location (or environment variable VAULT_CACERT): CA bundle used to verify the Vault server certificate.</li><li>ssl.certificate.location (or environment variable VAULT_CLIENT_CERT): client certificate for mutual TLS.</li><li>ssl.key.location (or environment variable VAULT_CLIENT_KEY): client private key for mutual TLS.</li></ul></li><li>An empty or unset CA value keeps verification enabled; it does not silently disable verification.</li></ul></li><li><strong>Confluent Platform: </strong>Not affected. The vulnerability resides in the confluent-kafka Python client library and does not affect Confluent Platform server components or their released versions.</li><li><strong>Confluent Cloud:</strong> Not affected. No remediation is required for Confluent Cloud.</li></ul>"}]}], "credits": [{"lang": "en", "value": "Rahul Karne", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-06T02:00:19.695616Z", "id": "CVE-2026-15911", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-06T02:01:13.972Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-15911", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-06T02:00:19.695616Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-06T02:01:08.619Z"}}], "cna": {"title": "Confluent Kafka Python Improper TLS Certificate Validation", "source": {"discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "finder", "value": "Rahul Karne"}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.4, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"cpes": ["cpe:2.3:a:confluent:confluent-kafka:*:*:*:*:*:*:*:*", "cpe:2.3:a:confluent:confluent-kafka:2.14.2:*:*:*:*:*:*:*"], "vendor": "confluent", "product": "confluent-kafka", "versions": [{"status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "2.14.2"}], "defaultStatus": "unaffected"}], "solutions": [{"lang": "en", "value": "* confluent-kafka (Python): This issue has been addressed in confluent-kafka (Python) 2.15.0, which: * Enables TLS certificate verification by default.\n * Exposes configuration to supply a custom CA bundle and an optional client certificate for mutual TLS, through both driver configuration and standard Vault environment variables: * ssl.ca.location (or environment variable VAULT_CACERT): CA bundle used to verify the Vault server certificate.\n * ssl.certificate.location (or environment variable VAULT_CLIENT_CERT): client certificate for mutual TLS.\n * ssl.key.location (or environment variable VAULT_CLIENT_KEY): client private key for mutual TLS.\n\n\n\n * An empty or unset CA value keeps verification enabled; it does not silently disable verification.\n\n\n\n * Confluent Platform: Not affected. The vulnerability resides in the confluent-kafka Python client library and does not affect Confluent Platform server components or their released versions.\n * Confluent Cloud: Not affected. No remediation is required for Confluent Cloud.", "supportingMedia": [{"type": "text/html", "value": "<ul><li><strong>confluent-kafka (Python): </strong>This issue has been addressed in confluent-kafka (Python) 2.15.0, which:<ul><li>Enables TLS certificate verification by default.</li><li>Exposes configuration to supply a custom CA bundle and an optional client certificate for mutual TLS, through both driver configuration and standard Vault environment variables:<ul><li>ssl.ca.location (or environment variable VAULT_CACERT): CA bundle used to verify the Vault server certificate.</li><li>ssl.certificate.location (or environment variable VAULT_CLIENT_CERT): client certificate for mutual TLS.</li><li>ssl.key.location (or environment variable VAULT_CLIENT_KEY): client private key for mutual TLS.</li></ul></li><li>An empty or unset CA value keeps verification enabled; it does not silently disable verification.</li></ul></li><li><strong>Confluent Platform: </strong>Not affected. The vulnerability resides in the confluent-kafka Python client library and does not affect Confluent Platform server components or their released versions.</li><li><strong>Confluent Cloud:</strong> Not affected. No remediation is required for Confluent Cloud.</li></ul>", "base64": false}]}], "references": [{"url": "https://support.confluent.io/hc/en-us/articles/54133146724244-CONFSA-2026-22-CVE-2026-15911-Confluent-Kafka-Python-Client-Vulnerability-TLS-Certificate-verification-disabled-by-default-in-HashiCorp-Vault-KMS-Integration", "tags": ["vendor-advisory", "patch"]}], "x_generator": {"engine": "Vulnogram 1.0.5"}, "descriptions": [{"lang": "en", "value": "Confluent Kafka Python client's HashiCorp Vault KMS integration could allow a remote attacker to obtain sensitive information due to improper TLS certificate validation.", "supportingMedia": [{"type": "text/html", "value": "Confluent Kafka Python client's HashiCorp Vault KMS integration could allow a remote attacker to obtain sensitive information due to improper TLS certificate validation.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-295", "description": "CWE-295 Improper certificate validation"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:confluent:confluent-kafka:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndIncluding": "2.14.2", "versionStartIncluding": "0"}], "operator": "OR"}], "operator": "OR"}], "providerMetadata": {"orgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "shortName": "ibm", "dateUpdated": "2026-10-01T18:29:42.297Z"}}}, "cveMetadata": {"cveId": "CVE-2026-15911", "state": "PUBLISHED", "dateUpdated": "2026-10-06T02:01:13.972Z", "dateReserved": "2026-07-15T19:28:12.162Z", "assignerOrgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "datePublished": "2026-10-01T18:29:42.297Z", "assignerShortName": "ibm"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:confluent:confluent-kafka:*:*:*:*:*:*:*:*", "cpe:2.3:a:confluent:confluent-kafka:2.14.2:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "product": "confluent-kafka", "vendor": "confluent", "versions": [{"lessThanOrEqual": "2.14.2", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "psirt@us.ibm.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Confluent Kafka Python client's HashiCorp Vault KMS integration could allow a remote attacker to obtain sensitive information due to improper TLS certificate validation."}], "id": "CVE-2026-15911", "lastModified": "2026-10-06T02:17:04.960", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "psirt@us.ibm.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-15911", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-06T02:00:19.695616Z", "version": "2.0.3"}}]}, "published": "2026-10-01T19:17:19.947", "references": [{"source": "psirt@us.ibm.com", "url": "https://support.confluent.io/hc/en-us/articles/54133146724244-CONFSA-2026-22-CVE-2026-15911-Confluent-Kafka-Python-Client-Vulnerability-TLS-Certificate-verification-disabled-by-default-in-HashiCorp-Vault-KMS-Integration"}], "sourceIdentifier": "psirt@us.ibm.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "psirt@us.ibm.com", "type": "Secondary"}]}

{"bugzilla": {"description": "confluent-kafka: confluent-kafka: Information disclosure via improper TLS certificate validation in HashiCorp Vault integration", "id": "2544809", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544809"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-295", "details": ["A flaw was found in confluent-kafka. The HashiCorp Vault Key Management Service (KMS) integration fails to properly validate Transport Layer Security (TLS) certificates by default. A remote attacker able to intercept network traffic could exploit this flaw to intercept and decrypt sensitive data or tamper with communications between the client and the Vault service."], "name": "CVE-2026-15911", "package_state": [{"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "satellite/iop-advisor-backend-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "satellite/iop-host-inventory-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "satellite/iop-insights-engine-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "satellite/iop-puptoo-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "satellite/iop-yuptoo-rhel9", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-10-01T18:29:42Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-15911\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-15911\nhttps://support.confluent.io/hc/en-us/articles/54133146724244-CONFSA-2026-22-CVE-2026-15911-Confluent-Kafka-Python-Client-Vulnerability-TLS-Certificate-verification-disabled-by-default-in-HashiCorp-Vault-KMS-Integration"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,2.14.2]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "confluent-kafka", "source": "cna", "vendor": "confluent"}, "product": "confluent-kafka", "vendor": "confluent"}], "created": "2026-10-01T19:30:11.917535+00:00", "updated": "2026-10-01T20:45:11.968360+00:00", "vendors": ["confluent", "confluent$PRODUCT$confluent-kafka"]}