{
  "cveId": "CVE-2026-27590",
  "url": "https://patchblox.com/security/cve/CVE-2026-27590",
  "summary": "CVE-2026-27590 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-27590, 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, Caddy\u0027s FastCGI path splitting logic computes the split index on a lowercased copy of the request path and then uses that byte index to slice the original path. This is unsafe for Unicode because \u0060strings.ToLower()\u0060 can change UTF-8 byte length for some characters. As a result, Caddy can derive an incorrect \u0060SCRIPT_NAME\u0060/\u0060SCRIPT_FILENAME\u0060 and \u0060PATH_INFO\u0060, potentially causing a request that contains \u0060.php\u0060 to execute a different on-disk file than intended (path confusion). In setups where an attacker can control file contents (e.g., upload features), this can lead to unintended PHP execution of non-.php files (potential RCE depending on deployment). Version 2.11.1 fixes the issue.",
  "published": "2026-02-24T17:29:04Z",
  "severity": "critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00614,
  "epssPercentile": 0.49704,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "caddy",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "2.6.2-5\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2026-27590",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-27590",
      "released": "2026-02-24T17:29:04Z"
    },
    {
      "platform": "linux",
      "product": "caddy",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "2.6.2-12\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-27590",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-27590",
      "released": "2026-02-24T17:29:04Z"
    },
    {
      "platform": "linux",
      "product": "caddy",
      "release": "Debian 14",
      "fixedVersion": "2.11.2-1",
      "fix": "DEBIAN-CVE-2026-27590",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-27590",
      "released": "2026-02-24T17:29:04Z"
    },
    {
      "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": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}