{"api_version":"1","generated_at":"2026-10-20T22:34:57+00:00","cve":"CVE-2026-86415","urls":{"html":"https://cve.report/CVE-2026-86415","api":"https://cve.report/api/cve/CVE-2026-86415.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-86415","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-86415"},"summary":{"title":"auto client cert connection reuse mixup","description":"libcurl's connection cache match function never considers the automatic client\ncertificate option, so a cached, already authenticated Schannel connection can\nbe handed to a transfer that got redirected to a different origin, even though\nthe code explicitly switched off the auto client cert option for that transfer\nto prevent exactly this.","state":"PUBLISHED","assigner":"curl","published_at":"2026-10-20 21:17:20","updated_at":"2026-10-20 21:17:20"},"problem_types":["CWE-201 Information Exposure Through Sent Data"],"metrics":[],"references":[{"url":"https://hackerone.com/reports/3993870","name":"https://hackerone.com/reports/3993870","refsource":"2499f714-1537-4658-8207-48ae4bb9eae9","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://curl.se/docs/CVE-2026-86415.html","name":"https://curl.se/docs/CVE-2026-86415.html","refsource":"2499f714-1537-4658-8207-48ae4bb9eae9","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://curl.se/docs/CVE-2026-86415.json","name":"https://curl.se/docs/CVE-2026-86415.json","refsource":"2499f714-1537-4658-8207-48ae4bb9eae9","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-86415","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86415","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"curl","product":"curl","version":"affected 8.22.0 8.22.0 semver","platforms":[]},{"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":"8.22.0","status":"affected","version":"8.22.0","versionType":"semver"},{"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":"libcurl's connection cache match function never considers the automatic client\ncertificate option, so a cached, already authenticated Schannel connection can\nbe handed to a transfer that got redirected to a different origin, even though\nthe code explicitly switched off the auto client cert option for that transfer\nto prevent exactly this."}],"problemTypes":[{"descriptions":[{"description":"CWE-201 Information Exposure Through Sent Data","lang":"en"}]}],"providerMetadata":{"dateUpdated":"2026-10-20T20:08:29.941Z","orgId":"2499f714-1537-4658-8207-48ae4bb9eae9","shortName":"curl"},"references":[{"name":"json","url":"https://curl.se/docs/CVE-2026-86415.json"},{"name":"www","url":"https://curl.se/docs/CVE-2026-86415.html"},{"name":"issue","url":"https://hackerone.com/reports/3993870"}],"title":"auto client cert connection reuse mixup"}},"cveMetadata":{"assignerOrgId":"2499f714-1537-4658-8207-48ae4bb9eae9","assignerShortName":"curl","cveId":"CVE-2026-86415","datePublished":"2026-10-20T20:08:29.941Z","dateReserved":"2026-09-07T12:11:55.106Z","dateUpdated":"2026-10-20T20:08:29.941Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-20 21:17:20","lastModifiedDate":"2026-10-20 21:17:20","problem_types":["CWE-201 Information Exposure Through Sent Data"],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"86415","Ordinal":"1","Title":"auto client cert connection reuse mixup","CVE":"CVE-2026-86415","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"86415","Ordinal":"1","NoteData":"libcurl's connection cache match function never considers the automatic client\ncertificate option, so a cached, already authenticated Schannel connection can\nbe handed to a transfer that got redirected to a different origin, even though\nthe code explicitly switched off the auto client cert option for that transfer\nto prevent exactly this.","Type":"Description","Title":"auto client cert connection reuse mixup"}]}}}