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CVE-2026-65624 Cowboy HTTP/1.1 max_headers Bypass via Duplicate Header Names Enables Memory Exhaustion

🗓️ 28 Jul 2026 10:01:01Reported by EEFType 
cvelist
 cvelist
🔗 www.cve.org👁 36 Views

Unauthenticated attacker can exhaust memory by sending duplicate HTTP header names, bypassing max_headers in Cowboy HTTP/1.1.

Related
Affected
Refs
[
  {
    "collectionURL": "https://repo.hex.pm",
    "cpes": [
      "cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"
    ],
    "defaultStatus": "unaffected",
    "modules": [
      "cowboy_http"
    ],
    "packageName": "cowboy",
    "packageURL": "pkg:hex/cowboy",
    "product": "cowboy",
    "programFiles": [
      "src/cowboy_http.erl"
    ],
    "programRoutines": [
      {
        "name": "cowboy_http:parse_header/3"
      },
      {
        "name": "cowboy_http:parse_hd_value/6"
      }
    ],
    "repo": "https://github.com/ninenines/cowboy",
    "vendor": "ninenines",
    "versions": [
      {
        "lessThan": "2.18.0",
        "status": "affected",
        "version": "2.0.0-pre.4",
        "versionType": "semver"
      }
    ]
  },
  {
    "collectionURL": "https://github.com",
    "cpes": [
      "cpe:2.3:a:ninenines:cowboy:*:*:*:*:*:*:*:*"
    ],
    "defaultStatus": "unaffected",
    "modules": [
      "cowboy_http"
    ],
    "packageName": "ninenines/cowboy",
    "packageURL": "pkg:github/ninenines/cowboy",
    "product": "cowboy",
    "programFiles": [
      "src/cowboy_http.erl"
    ],
    "programRoutines": [
      {
        "name": "cowboy_http:parse_header/3"
      },
      {
        "name": "cowboy_http:parse_hd_value/6"
      }
    ],
    "repo": "https://github.com/ninenines/cowboy",
    "vendor": "ninenines",
    "versions": [
      {
        "lessThan": "3a34d8c1cfd94326466aa16a9017236691dc9c55",
        "status": "affected",
        "version": "309780a9fda145c262a47ac7811ffd50a0271c5b",
        "versionType": "git"
      }
    ]
  }
]

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