{
  "cveId": "CVE-2026-52845",
  "url": "https://patchblox.com/security/cve/CVE-2026-52845",
  "summary": "CVE-2026-52845 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-52845, released June 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "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 2.11.4, forward_auth copy_headers deletes the exact client-supplied identity header before copying the trusted value from the auth gateway. But when the request later goes through php_fastcgi, Caddy normalizes HTTP headers into CGI variables by replacing - with _. This lets a client send an underscore alias that survives the forward_auth delete step but becomes the same PHP/FastCGI variable. Result: a remote client can inject or sometimes override identity/group headers trusted by PHP/FastCGI applications behind Caddy. This vulnerability is fixed in 2.11.4.",
  "published": "2026-06-23T18:18:05Z",
  "severity": "high",
  "cvss": 8.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
  "epss": 0.00445,
  "epssPercentile": 0.38972,
  "priority": "High",
  "priorityTier": 3,
  "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-2026-52845",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-52845",
      "released": "2026-06-23T18:18:05Z"
    },
    {
      "platform": "linux",
      "product": "caddy",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "2.6.2-12\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-52845",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-52845",
      "released": "2026-06-23T18:18:05Z"
    },
    {
      "platform": "linux",
      "product": "caddy",
      "release": "Debian 14",
      "fixedVersion": "2.11.4-1",
      "fix": "DEBIAN-CVE-2026-52845",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-52845",
      "released": "2026-06-23T18:18:05Z"
    },
    {
      "platform": "linux",
      "product": "govulncheck-vulndb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "0.0.20260727T201416-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21551-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21551-1",
      "released": "2026-08-10T17:38:07Z"
    },
    {
      "platform": "linux",
      "product": "govulncheck-vulndb",
      "release": "sles 16.0",
      "fixedVersion": "0.0.20260727T201416-160000.1.1",
      "fix": "SUSE-SU-2026:23227-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23227-1",
      "released": "2026-08-10T17:34:15Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}