{"id":"CVE-2026-86413","state":"PUBLISHED","title":"Negotiate credentials sent to redirected origin","description":"When using an *ambient user* in a first transfer doing Negotiate\nauthentication and asked to follow redirects, curl could pass on its\ncredential details to an unrelated second origin when asked to redirect there.","publishedAt":"2026-10-20T20:06:11.699Z","updatedAt":"2026-10-30T11:44:06.616Z","severity":{"score":9.1,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","source":"CISA-ADP"},"assigner":"curl","products":["curl curl"],"affected":[{"vendor":"curl","product":"curl","defaultStatus":"unaffected","versions":[{"version":"8.22.0","status":"affected","lessThanOrEqual":"8.22.0","versionType":"semver"},{"version":"8.21.0","status":"affected","lessThanOrEqual":"8.21.0","versionType":"semver"}]}],"references":["https://curl.se/docs/CVE-2026-86413.json","https://curl.se/docs/CVE-2026-86413.html","https://hackerone.com/reports/3993549"],"weaknesses":["CWE-201"],"ingestedAt":"2026-10-30T11:48:06.434Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/86xxx/CVE-2026-86413.json","commit":"64508f65ea7ad73daec20acd5b8b1a7a4ccb1eb5","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-86413","state":"PUBLISHED","datePublished":"2026-10-20T20:06:11.699Z","dateUpdated":"2026-10-30T11:44:06.616Z","assignerShortName":"curl","assignerOrgId":"2499f714-1537-4658-8207-48ae4bb9eae9","dateReserved":"2026-09-07T12:11:52.093Z"},"containers":{"cna":{"title":"Negotiate credentials sent to redirected origin","descriptions":[{"lang":"en","value":"When using an *ambient user* in a first transfer doing Negotiate\nauthentication and asked to follow redirects, curl could pass on its\ncredential details to an unrelated second origin when asked to redirect there."}],"affected":[{"vendor":"curl","product":"curl","defaultStatus":"unaffected","versions":[{"version":"8.22.0","status":"affected","lessThanOrEqual":"8.22.0","versionType":"semver"},{"version":"8.21.0","status":"affected","lessThanOrEqual":"8.21.0","versionType":"semver"}]}],"references":[{"url":"https://curl.se/docs/CVE-2026-86413.json","name":"json"},{"url":"https://curl.se/docs/CVE-2026-86413.html","name":"www"},{"url":"https://hackerone.com/reports/3993549","name":"issue"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-201 Information Exposure Through Sent Data"}]}],"providerMetadata":{"shortName":"curl","orgId":"2499f714-1537-4658-8207-48ae4bb9eae9","dateUpdated":"2026-10-20T20:06:11.699Z"},"credits":[{"lang":"en","value":"Stanislav Fort (Aisle Research)","type":"finder"},{"lang":"en","value":"Stefan Eissing","type":"remediation developer"}]},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://hackerone.com/reports/3993549","tags":["exploit"]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.1,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-10-30T11:43:03.805545Z","id":"CVE-2026-86413","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-201","type":"CWE","lang":"en","description":"CWE-201 Insertion of Sensitive Information Into Sent Data"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-30T11:44:06.616Z"}}]}}}