{"id":"CVE-2026-86411","aliases":[],"cve":{"records":[{"id":"CVE-2026-86411","source":"curl","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-07T12:11:48.560Z","published":"2026-10-20T20:02:03.431Z","modified":"2026-10-29T18:42:03.095Z"}],"publishers":[{"name":"curl","role":"CNA","organizationId":"2499f714-1537-4658-8207-48ae4bb9eae9","modified":"2026-10-20T20:02:03.431Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T18:42:03.095Z"}],"references":[{"url":"https://curl.se/docs/CVE-2026-86411.json","tags":[],"source":"curl"},{"url":"https://curl.se/docs/CVE-2026-86411.html","tags":[],"source":"curl"},{"url":"https://hackerone.com/reports/3973190","tags":[],"source":"curl"},{"url":"https://hackerone.com/reports/3973190","tags":["exploit"],"source":"CISA-ADP"}],"weaknesses":[{"id":"CWE-488","description":"CWE-488 Exposure of Data Element to Wrong Session","source":"CISA-ADP"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-29T18:41:51.847885Z","decisions":[{"name":"Exploitation","value":"poc"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"total"}]}]},"title":"FTP connection reuse inherits client-certificate","titleSource":"curl","descriptionSource":"curl","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.","score":9.1,"severity":"critical","published":"2026-10-20T20:02:03.431Z","modified":"2026-10-29T18:42:03.095Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"curl","name":"curl","platforms":[],"versions":[{"version":"8.21.0","status":"affected","lessThanOrEqual":"8.21.0","versionType":"semver"}],"defaultStatus":"unaffected","cpes":[],"source":"curl","url":"https://www.cve.org/CVERecord?id=CVE-2026-86411"}],"remediation":[],"references":["https://curl.se/docs/CVE-2026-86411.json","https://curl.se/docs/CVE-2026-86411.html","https://hackerone.com/reports/3973190"],"sources":[{"name":"CVE","id":"CVE-2026-86411","modified":"2026-10-29T18:42:03.095Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-86411"}],"assessments":[{"source":"CISA-ADP","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1}],"sourceAffected":[],"observedAt":"2026-10-29T18:54:19.642Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T03:35:31.150Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-29T18:55:31.014Z","attemptedAt":"2026-10-29T18:55:31.014Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-29T18:55:31.014Z","attemptedAt":"2026-10-29T18:55:31.014Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-29T18:55:31.014Z","attemptedAt":"2026-10-29T18:55:31.014Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-29T18:55:31.250Z","attemptedAt":"2026-10-29T18:55:31.250Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-105276","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-105276","modified":"Oct 20, 2026, 8:02:03 PM","checkedAt":"2026-10-29T18:55:31.014Z"},{"source":"GitHub Advisory Database","id":"GHSA-533v-mrfx-494r","url":"https://github.com/advisories/GHSA-533v-mrfx-494r","modified":"2026-10-20T21:31:03Z","checkedAt":"2026-10-29T18:55:31.014Z"},{"source":"NVD","id":"CVE-2026-86411","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86411","modified":"2026-10-22T17:21:57.293","checkedAt":"2026-10-29T18:55:31.014Z"},{"source":"FIRST EPSS","id":"CVE-2026-86411","url":"https://www.first.org/epss/","probability":0.00153,"percentile":0.04389,"date":"2026-10-29","checkedAt":"2026-10-29T18:55:31.250Z"}],"aiSummary":null}