{"id":"CVE-2026-86413","title":"Negotiate credentials sent to redirected origin","summary":"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.","severity":"none","cwe":["CWE-201"],"vendor":"curl","product":"curl","affected":["curl >= 8.22.0 <= 8.22.0","curl >= 8.21.0 <= 8.21.0"],"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T20:06:11.699Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-86413","references":[{"url":"https://curl.se/docs/CVE-2026-86413.json","label":"json"},{"url":"https://curl.se/docs/CVE-2026-86413.html","label":"www"},{"url":"https://hackerone.com/reports/3993549","label":"issue"}],"tags":["cve.org"],"ingestedAt":"2026-10-20T20:18:14.525Z","slug":"CVE-2026-86413","body":"## Overview\n\nWhen 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.\n\n## Affected\n\n- `curl >= 8.22.0 <= 8.22.0`\n- `curl >= 8.21.0 <= 8.21.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}