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CVE-2026-40562

Estado: AnalizadaAlta (7.5)—

Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence.

Gazelle incorrectly prioritizes "Content-Length" over "Transfer-Encoding: chunked" 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.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Acceso en red sin autenticación (AV:N/PR:N) explotando app web. El smuggling de requests permite inyectar/manipular datos entre cliente y servidor, y actuar como proxy malicioso.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationNetwork Intrusion PreventionLimit Access to Resource Over NetworkFilter Network Traffic

Tecnologías afectadas (1)

Kazeburo — Gazelle

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-40562",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40562",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-06T14:14:25.637199Z"
        }
      }
    ],
    "cvssMetricV31": [
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          "attackVector": "NETWORK",
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          "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
      }
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  "affected": [
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      "affectedData": [
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          "repo": "https://github.com/kazeburo/Gazelle",
          "vendor": "KAZEBURO",
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          "versions": [
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              "version": "0",
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  "published": "2026-05-06T13:16:09.110",
  "references": [
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      "tags": [
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    },
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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    {
      "lang": "en",
      "value": "Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence.\n\nGazelle incorrectly prioritizes \"Content-Length\" over \"Transfer-Encoding: chunked\" when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence.\n\nAn attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy."
    }
  ],
  "lastModified": "2026-06-17T10:45:27.267",
  "configurations": [
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      "nodes": [
        {
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          "cpeMatch": [
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}