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CVE-2026-43971 Link Header Directive Smuggling via Unescaped target/rel/Attribute Keys in cow_link:link/1

🗓️ 18 Aug 2026 09:01:53Reported by EEFType 
cvelist
 cvelist
🔗 www.cve.org👁 39 Views

cowlib 2.9.0+ unescaped Link header fields enable directive smuggling to preconnect/preload/prerender.

Related
Affected
Refs
[
  {
    "collectionURL": "https://repo.hex.pm",
    "cpes": [
      "cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"
    ],
    "defaultStatus": "unaffected",
    "modules": [
      "cow_link"
    ],
    "packageName": "cowlib",
    "packageURL": "pkg:hex/cowlib",
    "product": "cowlib",
    "programFiles": [
      "src/cow_link.erl"
    ],
    "programRoutines": [
      {
        "name": "cow_link:link/1"
      },
      {
        "name": "cow_link:do_link/1"
      },
      {
        "name": "cow_link:escape/2"
      }
    ],
    "repo": "https://github.com/ninenines/cowlib",
    "vendor": "ninenines",
    "versions": [
      {
        "lessThan": "2.20.0",
        "status": "affected",
        "version": "2.9.0",
        "versionType": "semver"
      }
    ]
  },
  {
    "collectionURL": "https://github.com",
    "cpes": [
      "cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"
    ],
    "defaultStatus": "unaffected",
    "modules": [
      "cow_link"
    ],
    "packageName": "ninenines/cowlib",
    "packageURL": "pkg:github/ninenines/cowlib",
    "product": "cowlib",
    "programFiles": [
      "src/cow_link.erl"
    ],
    "programRoutines": [
      {
        "name": "cow_link:link/1"
      },
      {
        "name": "cow_link:do_link/1"
      },
      {
        "name": "cow_link:escape/2"
      }
    ],
    "repo": "https://github.com/ninenines/cowlib",
    "vendor": "ninenines",
    "versions": [
      {
        "lessThan": "89da27ee4c241f5d649ba7d9b7f2188918af6cea",
        "status": "affected",
        "version": "485d58dfa91b91d98135dc95e5615f421715dae5",
        "versionType": "git"
      }
    ]
  }
]

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16 Sep 2026 20:24Current
CVSS 46.3
EPSS0.00524
SSVC
39