{"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"}}]}}