{"api_version":"1","generated_at":"2026-09-11T01:57:26+00:00","cve":"CVE-2026-59565","urls":{"html":"https://cve.report/CVE-2026-59565","api":"https://cve.report/api/cve/CVE-2026-59565.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-59565","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-59565"},"summary":{"title":"Local and kernel denial-of-service","description":"A remotely exploitable buffer overflow bug can cause a local and kernel denial-of-service attack on affected versions of Zscaler Client Connector on Windows.","state":"PUBLISHED","assigner":"Zscaler","published_at":"2026-08-24 14:16:55","updated_at":"2026-08-28 18:39:48"},"problem_types":["CWE-229","CWE-229 CWE-229 Improper handling of values"],"metrics":[{"version":"3.1","source":"cve@zscaler.com","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2026","name":"https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2026","refsource":"cve@zscaler.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-59565","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59565","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Zscaler","product":"Client Connector","version":"affected Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 custom","platforms":["Windows"]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"59565","cve":"CVE-2026-59565","epss":"0.002700000","percentile":"0.188840000","score_date":"2026-08-30","updated_at":"2026-08-31 00:14:05"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-59565","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-08-24T15:18:07.595772Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-08-24T15:18:31.082Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"affected","platforms":["Windows"],"product":"Client Connector","vendor":"Zscaler","versions":[{"lessThan":"Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372","status":"affected","version":"0","versionType":"custom"}]}],"datePublic":"2026-08-21T09:48:00.000Z","descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"A remotely exploitable buffer overflow bug can cause a local and kernel denial-of-service attack on affected versions of Zscaler Client Connector on Windows."}],"value":"A remotely exploitable buffer overflow bug can cause a local and kernel denial-of-service attack on affected versions of Zscaler Client Connector on Windows."}],"impacts":[{"capecId":"CAPEC-100","descriptions":[{"lang":"en","value":"CAPEC-100 Overflow Buffers"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-229","description":"CWE-229 Improper handling of values","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-24T13:40:23.684Z","orgId":"73c6f63b-efac-410d-a0a9-569700f85a04","shortName":"Zscaler"},"references":[{"url":"https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2026"}],"source":{"discovery":"UNKNOWN"},"title":"Local and kernel denial-of-service","x_generator":{"engine":"Vulnogram 1.0.4"}}},"cveMetadata":{"assignerOrgId":"73c6f63b-efac-410d-a0a9-569700f85a04","assignerShortName":"Zscaler","cveId":"CVE-2026-59565","datePublished":"2026-08-24T13:40:23.684Z","dateReserved":"2026-07-06T06:18:59.633Z","dateUpdated":"2026-08-24T15:18:31.082Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-24 14:16:55","lastModifiedDate":"2026-08-28 18:39:48","problem_types":["CWE-229","CWE-229 CWE-229 Improper handling of values"],"metrics":{"cvssMetricV31":[{"source":"cve@zscaler.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-24T15:18:07.595772Z","id":"CVE-2026-59565","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"59565","Ordinal":"1","Title":"Local and kernel denial-of-service","CVE":"CVE-2026-59565","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"59565","Ordinal":"1","NoteData":"A remotely exploitable buffer overflow bug can cause a local and kernel denial-of-service attack on affected versions of Zscaler Client Connector on Windows.","Type":"Description","Title":"Local and kernel denial-of-service"}]}}}