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CVE-2026-47072

Estado: AnalizadaMedia (6.9)—

Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in benoitc hackney allows HTTP Request/Response Splitting. The WebSocket upgrade code in src/hackney_ws.erl copies the host, path, headers (ExtraHeaders), and protocols options from the caller-supplied opts map into the internal #ws_data{} record in init/1 and then splices them verbatim into the raw HTTP/1.1 upgrade request by binary concatenation in do_handshake/1. No CRLF or NUL stripping is performed at any of these four injection sites.

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An attacker who controls any of these options — for example by forwarding URL components or header values from untrusted input into hackney_ws:start_link/1 — can inject arbitrary HTTP headers into the outbound WebSocket upgrade request, leading to header injection, credential spoofing toward the upstream server, log and cache poisoning, or request smuggling via intermediary proxies.

This issue affects hackney: from 2.0.0 before 4.0.1.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Benoitc — Hackney

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-47072",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-47072",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-26T15:46:12.092004Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 6.9,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "HIGH",
          "vulnIntegrityImpact": "LOW",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/benoitc/hackney",
          "vendor": "benoitc",
          "modules": [
            "hackney_ws"
          ],
          "product": "hackney",
          "versions": [
            {
              "status": "affected",
              "version": "2.0.0",
              "lessThan": "4.0.1",
              "versionType": "semver"
            }
          ],
          "packageURL": "pkg:hex/hackney",
          "packageName": "hackney",
          "programFiles": [
            "src/hackney_ws.erl"
          ],
          "collectionURL": "https://repo.hex.pm",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "hackney_ws:do_handshake/1"
            },
            {
              "name": "hackney_ws:init/1"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/benoitc/hackney",
          "vendor": "benoitc",
          "modules": [
            "hackney_ws"
          ],
          "product": "hackney",
          "versions": [
            {
              "status": "affected",
              "version": "690cecaf236fba49526da404a5bc889a24367a3e",
              "lessThan": "52310ca807e7b48441ba0e9129171f535313fdd1",
              "versionType": "git"
            }
          ],
          "packageURL": "pkg:github/benoitc/hackney",
          "packageName": "benoitc/hackney",
          "programFiles": [
            "src/hackney_ws.erl"
          ],
          "collectionURL": "https://github.com",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "hackney_ws:do_handshake/1"
            },
            {
              "name": "hackney_ws:init/1"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-05-25T15:16:22.280",
  "references": [
    {
      "url": "https://cna.erlef.org/cves/CVE-2026-47072.html",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/benoitc/hackney/commit/52310ca807e7b48441ba0e9129171f535313fdd1",
      "tags": [
        "Patch"
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/benoitc/hackney/security/advisories/GHSA-f9vr-g2g2-x9fg",
      "tags": [
        "Exploit",
        "Patch",
        "Vendor Advisory"
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-47072",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/benoitc/hackney/security/advisories/GHSA-f9vr-g2g2-x9fg",
      "tags": [
        "Exploit",
        "Patch",
        "Vendor Advisory"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "description": [
        {
          "lang": "en",
          "value": "CWE-93"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in benoitc hackney allows HTTP Request/Response Splitting. The WebSocket upgrade code in src/hackney_ws.erl copies the host, path, headers (ExtraHeaders), and protocols options from the caller-supplied opts map into the internal #ws_data{} record in init/1 and then splices them verbatim into the raw HTTP/1.1 upgrade request by binary concatenation in do_handshake/1. No CRLF or NUL stripping is performed at any of these four injection sites. An attacker who controls any of these options — for example by forwarding URL components or header values from untrusted input into hackney_ws:start_link/1 — can inject arbitrary HTTP headers into the outbound WebSocket upgrade request, leading to header injection, credential spoofing toward the upstream server, log and cache poisoning, or request smuggling via intermediary proxies.\n\nThis issue affects hackney: from 2.0.0 before 4.0.1."
    },
    {
      "lang": "es",
      "value": "La vulnerabilidad de Neutralización Inadecuada de Secuencias CRLF ('Inyección CRLF') en benoitc hackney permite la División de Solicitudes/Respuestas HTTP. El código de actualización de WebSocket en src/hackney_ws.erl copia las opciones de host, ruta, encabezados (ExtraHeaders) y protocolos del mapa de opciones (opts map) proporcionado por el llamador en el registro interno #ws_data{} en init/1 y luego los empalma textualmente en la solicitud de actualización HTTP/1.1 sin procesar mediante concatenación binaria en do_handshake/1. No se realiza ninguna eliminación de CRLF o NUL en ninguno de estos cuatro sitios de inyección. Un atacante que controla cualquiera de estas opciones - por ejemplo, reenviando componentes de URL o valores de encabezado de entrada no confiable a hackney_ws:start_link/1 - puede inyectar encabezados HTTP arbitrarios en la solicitud de actualización de WebSocket saliente, lo que lleva a la inyección de encabezados, suplantación de credenciales hacia el servidor ascendente, envenenamiento de registros y caché, o contrabando de solicitudes a través de proxies intermediarios.\n\nEste problema afecta a hackney: desde 2.0.0 antes de 4.0.1."
    }
  ],
  "lastModified": "2026-07-24T10:10:00.197",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B119C170-E9CA-4AEE-BE04-F074E70CBF82",
              "versionEndExcluding": "4.0.1",
              "versionStartIncluding": "2.0.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
}