{
  "cveId": "CVE-2026-27586",
  "url": "https://patchblox.com/security/cve/CVE-2026-27586",
  "summary": "CVE-2026-27586 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-27586, released February 24, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "caddy: Caddy is an extensible server platform that uses TLS by default",
  "description": "Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, two swallowed errors in \u0060ClientAuthentication.provision()\u0060 cause mTLS client certificate authentication to silently fail open when a CA certificate file is missing, unreadable, or malformed. The server starts without error but accepts any client certificate signed by any system-trusted CA, completely bypassing the intended private CA trust boundary. Any deployment using \u0060trusted_ca_cert_file\u0060 or \u0060trusted_ca_certs_pem_files\u0060 for mTLS will silently degrade to accepting any system-trusted client certificate if the CA file becomes unavailable. This can happen due to a typo in the path, file rotation, corruption, or permission changes. The server gives no indication that mTLS is misconfigured. Version 2.11.1 fixes the vulnerability.",
  "published": "2026-02-24T17:29:03Z",
  "severity": "critical",
  "cvss": 9.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss": 0.00295,
  "epssPercentile": 0.22244,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "caddy",
      "release": "Debian 14",
      "fixedVersion": "2.11.2-1",
      "fix": "DEBIAN-CVE-2026-27586",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-27586",
      "released": "2026-02-24T17:29:03Z"
    },
    {
      "platform": "linux",
      "product": "caddy",
      "release": "Fedora 43",
      "fixedVersion": "2.10.2-9.fc43",
      "fix": "FEDORA-2026-3DC324BD9A",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-3dc324bd9a",
      "released": "2026-06-23T21:10:09Z"
    },
    {
      "platform": "linux",
      "product": "caddy-debuginfo",
      "release": "Fedora 43",
      "fixedVersion": "2.10.2-9.fc43",
      "fix": "FEDORA-2026-3DC324BD9A",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-3dc324bd9a",
      "released": "2026-06-23T21:10:09Z"
    },
    {
      "platform": "linux",
      "product": "caddy-debugsource",
      "release": "Fedora 43",
      "fixedVersion": "2.10.2-9.fc43",
      "fix": "FEDORA-2026-3DC324BD9A",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-3dc324bd9a",
      "released": "2026-06-23T21:10:09Z"
    },
    {
      "platform": "linux",
      "product": "govulncheck-vulndb",
      "release": "opensuse-leap 15.6",
      "fixedVersion": "0.0.20260226T182644-150000.1.149.1",
      "fix": "SUSE-SU-2026:0757-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-0757-1",
      "released": "2026-03-03T11:34:04Z"
    },
    {
      "platform": "linux",
      "product": "govulncheck-vulndb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "0.0.20260723T184607-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21483-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21483-1",
      "released": "2026-07-30T09:09:47Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}