{
  "cveId": "CVE-2026-40561",
  "url": "https://patchblox.com/security/cve/CVE-2026-40561",
  "summary": "CVE-2026-40561 is fixed in starlet on 1 platform, first by DEBIAN-CVE-2026-40561, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "starlet: Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence",
  "description": "Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence.  Starlet incorrectly prioritizes \u0022Content-Length\u0022 over \u0022Transfer-Encoding: chunked\u0022 when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence.  An attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy.",
  "published": "2026-05-03T01:15:58Z",
  "severity": "medium",
  "cvss": 5.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
  "epss": 0.00364,
  "epssPercentile": 0.30384,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "starlet",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "0.31-2\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-40561",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-40561",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "starlet",
      "release": "Debian 14",
      "fixedVersion": "0.31-3",
      "fix": "DEBIAN-CVE-2026-40561",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-40561",
      "released": "2026-05-15T16:01:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}