{"api_version":"1","generated_at":"2026-10-20T22:35:29+00:00","cve":"CVE-2026-86411","urls":{"html":"https://cve.report/CVE-2026-86411","api":"https://cve.report/api/cve/CVE-2026-86411.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-86411","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-86411"},"summary":{"title":"FTP connection reuse inherits client-certificate","description":"An `ftp://` transfer configured with `CURLUSESSL_NONE` can reuse a pooled FTP\ncontrol connection that a previous easy handle upgraded with `STARTTLS` and\nauthenticated using a client certificate. The second handle performs neither a\nnew TLS handshake nor a new FTP login, so the server continues to authorize it\nunder the first handle's certificate identity.","state":"PUBLISHED","assigner":"curl","published_at":"2026-10-20 20:17:25","updated_at":"2026-10-20 20:17:25"},"problem_types":["CWE-488 Exposure of Data Element to Wrong Session"],"metrics":[],"references":[{"url":"https://hackerone.com/reports/3973190","name":"https://hackerone.com/reports/3973190","refsource":"2499f714-1537-4658-8207-48ae4bb9eae9","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://curl.se/docs/CVE-2026-86411.html","name":"https://curl.se/docs/CVE-2026-86411.html","refsource":"2499f714-1537-4658-8207-48ae4bb9eae9","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://curl.se/docs/CVE-2026-86411.json","name":"https://curl.se/docs/CVE-2026-86411.json","refsource":"2499f714-1537-4658-8207-48ae4bb9eae9","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-86411","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86411","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"curl","product":"curl","version":"affected 8.21.0 8.21.0 semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"Stanislav Fort (Aisle Research)","lang":"en"},{"source":"CNA","value":"Stefan Eissing","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"curl","vendor":"curl","versions":[{"lessThanOrEqual":"8.21.0","status":"affected","version":"8.21.0","versionType":"semver"}]}],"credits":[{"lang":"en","type":"finder","value":"Stanislav Fort (Aisle Research)"},{"lang":"en","type":"remediation developer","value":"Stefan Eissing"}],"descriptions":[{"lang":"en","value":"An `ftp://` transfer configured with `CURLUSESSL_NONE` can reuse a pooled FTP\ncontrol connection that a previous easy handle upgraded with `STARTTLS` and\nauthenticated using a client certificate. The second handle performs neither a\nnew TLS handshake nor a new FTP login, so the server continues to authorize it\nunder the first handle's certificate identity."}],"problemTypes":[{"descriptions":[{"description":"CWE-488 Exposure of Data Element to Wrong Session","lang":"en"}]}],"providerMetadata":{"dateUpdated":"2026-10-20T20:02:03.431Z","orgId":"2499f714-1537-4658-8207-48ae4bb9eae9","shortName":"curl"},"references":[{"name":"json","url":"https://curl.se/docs/CVE-2026-86411.json"},{"name":"www","url":"https://curl.se/docs/CVE-2026-86411.html"},{"name":"issue","url":"https://hackerone.com/reports/3973190"}],"title":"FTP connection reuse inherits client-certificate"}},"cveMetadata":{"assignerOrgId":"2499f714-1537-4658-8207-48ae4bb9eae9","assignerShortName":"curl","cveId":"CVE-2026-86411","datePublished":"2026-10-20T20:02:03.431Z","dateReserved":"2026-09-07T12:11:48.560Z","dateUpdated":"2026-10-20T20:02:03.431Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-20 20:17:25","lastModifiedDate":"2026-10-20 20:17:25","problem_types":["CWE-488 Exposure of Data Element to Wrong Session"],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"86411","Ordinal":"1","Title":"FTP connection reuse inherits client-certificate","CVE":"CVE-2026-86411","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"86411","Ordinal":"1","NoteData":"An `ftp://` transfer configured with `CURLUSESSL_NONE` can reuse a pooled FTP\ncontrol connection that a previous easy handle upgraded with `STARTTLS` and\nauthenticated using a client certificate. The second handle performs neither a\nnew TLS handshake nor a new FTP login, so the server continues to authorize it\nunder the first handle's certificate identity.","Type":"Description","Title":"FTP connection reuse inherits client-certificate"}]}}}