{"schema":"threatline.record/2","record":{"id":"CVE-2026-87861","aliases":[],"summary":"cross-origin reuse of a Negotiate connection","details":"When using ambient user credentials, an HTTP request directed to one origin\nmay be dispatched over a connection previously authenticated via Negotiate for\na different origin, leaving the request's intended credentials unused.","categories":["Libraries & packages"],"product":"curl","vendor":"curl","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-87861","source_modified_at":"2026-10-20T20:09:28.592Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"curl","vendor":"curl","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"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00291,"percentile":0.20513,"score_date":"2026-10-23"},"published_at":"2026-10-20T20:09:28.592Z","modified_at":"2026-10-20T20:09:28.592Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-87861","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-20T20:09:28.592Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-87861","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://curl.se/docs/CVE-2026-87861.json"},{"source":"CVE List","url":"https://curl.se/docs/CVE-2026-87861.html"},{"source":"CVE List","url":"https://hackerone.com/reports/3972094"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-20T20:09:28.592Z","content_hash":"60c39624bf0da89a7c2d61e18fa6c7344c6819d25db84c09ced4777516e20f29"}}