{"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": "2026-10-01T18:29:42.297Z"}, "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"}}}}

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{"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": "2026-10-01T19:17:19.947", "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": "Primary"}]}, "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": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "psirt@us.ibm.com", "type": "Primary"}]}

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{"created": "2026-10-01T19:30:11.917535+00:00", "updated": "2026-10-01T19:30:11.917549+00:00", "vendors": []}