{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-86415", "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "state": "PUBLISHED", "assignerShortName": "curl", "dateReserved": "2026-09-07T12:11:55.106Z", "datePublished": "2026-10-20T20:08:29.941Z", "dateUpdated": "2026-10-20T20:08:29.941Z"}, "containers": {"cna": {"title": "auto client cert connection reuse mixup", "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."}], "providerMetadata": {"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "shortName": "curl", "dateUpdated": "2026-10-20T20:08:29.941Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-201 Information Exposure Through Sent Data"}]}], "affected": [{"vendor": "curl", "product": "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"}], "references": [{"url": "https://curl.se/docs/CVE-2026-86415.json", "name": "json"}, {"url": "https://curl.se/docs/CVE-2026-86415.html", "name": "www"}, {"url": "https://hackerone.com/reports/3993870", "name": "issue"}], "credits": [{"lang": "en", "value": "Stanislav Fort (Aisle Research)", "type": "finder"}, {"lang": "en", "value": "Stefan Eissing", "type": "remediation developer"}]}}}

{}

{"affected": [{"affectedData": [{"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"}]}], "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}], "cveTags": [], "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."}], "id": "CVE-2026-86415", "lastModified": "2026-10-22T16:57:53.407", "metrics": {}, "published": "2026-10-20T21:17:20.067", "references": [{"source": "2499f714-1537-4658-8207-48ae4bb9eae9", "url": "https://curl.se/docs/CVE-2026-86415.html"}, {"source": "2499f714-1537-4658-8207-48ae4bb9eae9", "url": "https://curl.se/docs/CVE-2026-86415.json"}, {"source": "2499f714-1537-4658-8207-48ae4bb9eae9", "url": "https://hackerone.com/reports/3993870"}], "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9", "vulnStatus": "Awaiting Analysis"}

{"acknowledgement": "Red Hat would like to thank Stanislav Fort (Aisle Research) for reporting this issue.", "bugzilla": {"description": "curl: curl: auto client cert connection reuse mixup", "id": "2550604", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2550604"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-201", "details": ["A flaw was found in curl. In builds configured with the Microsoft Schannel Transport Layer Security (TLS) backend, libcurl's connection cache fails to evaluate client certificate authentication settings when handling HTTP redirects. A malicious server can redirect a transfer to a different destination, causing curl to inappropriately reuse an already authenticated connection. This issue can result in information disclosure by exposing client certificates and credentials to unintended origins."], "name": "CVE-2026-86415", "package_state": [{"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Not affected", "package_name": "build-of-trustee/trustee-rhel9", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Not affected", "package_name": "openshift-sandboxed-containers/osc-podvm-payload-rhel9", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "igvm", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "rust", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "s390utils", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "snphost", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "trustee", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "rust", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "snphost", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "rust", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Not affected", "package_name": "jbcs-httpd24-curl", "product_name": "Red Hat JBoss Core Services"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "foreman", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "openvox-agent", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "puppet-agent", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-10-14T12:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-86415\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-86415"], "statement": "This vulnerability is rated as Low impact for Red Hat products because exploitation is restricted to builds utilizing the Windows-specific Schannel TLS backend. Red Hat distributions compile curl and libcurl with OpenSSL rather than Schannel. As a result, the vulnerable code paths are not present or active in Red Hat environments.", "threat_severity": "Low"}