{
  "schema_version": "1.5.0",
  "id": "CURL-CVE-2026-86415",
  "aliases": [
    "CVE-2026-86415"
  ],
  "summary": "auto client cert connection reuse mixup",
  "modified": "2026-10-14T08:17:29.00Z",
  "database_specific": {
    "package": "curl",
    "affects": "both",
    "URL": "https://curl.se/docs/CVE-2026-86415.json",
    "www": "https://curl.se/docs/CVE-2026-86415.html",
    "issue": "https://hackerone.com/reports/3993870",
    "CWE": {
      "id": "CWE-201",
      "desc": "Information Exposure Through Sent Data"
    },
    "last_affected": "8.22.0",
    "severity": "Low"
  },
  "published": "2026-10-14T08:00:00.00Z",
  "affected": [
    {
      "ranges": [
        {
           "type": "SEMVER",
           "events": [
             {"introduced": "8.21.0"},
             {"fixed": "8.23.0"}
           ]
        },
        {
           "type": "GIT",
           "repo": "https://github.com/curl/curl.git",
           "events": [
             {"introduced": "d69bfad3fa3daf5e72331f6870667607828d5891"},
             {"fixed": "00271cfcb95b6481a1f91ce0a0dad5d64d2e89a9"}
           ]
        }
      ],
      "versions": [
        "8.22.0", "8.21.0"
      ]
    }
  ],
  "credits": [
    {
      "name": "Stanislav Fort (Aisle Research)",
      "type": "FINDER"
    },
    {
      "name": "Stefan Eissing",
      "type": "REMEDIATION_DEVELOPER"
    }
  ],
  "details": "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."
}