CVE-2026-40562

{
  "id": "CVE-2026-40562",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "published": "2026-05-06T13:16:09.110",
  "lastModified": "2026-10-26T19:10:00.163",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "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."
    },
    {
      "lang": "es",
      "value": "Las versiones de Gazelle hasta la 0.49 para Perl permiten el Contrabando de Solicitudes HTTP a través de una Precedencia de Encabezado Inadecuada.\n\nGazelle prioriza incorrectamente ’Content-Length’ sobre ’Transfer-Encoding: chunked’ cuando ambos encabezados están presentes en una solicitud HTTP. Según la RFC 7230 3.3.3, Transfer-Encoding debe tener precedencia.\n\nUn atacante podría explotar esto para contrabandear solicitudes HTTP maliciosas a través de un proxy inverso de front-end."
    }
  ],
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "vendor": "KAZEBURO",
          "product": "Gazelle",
          "defaultStatus": "unaffected",
          "collectionURL": "https://cpan.org/modules",
          "packageName": "Gazelle",
          "programFiles": [
            "lib/Plack/Handler/Gazelle.pm",
            "lib/Plack/Handler/Gazelle.xs"
          ],
          "programRoutines": [
            {
              "name": "Plack::Handler::Gazelle::run"
            },
            {
              "name": "lib/Plack/Handler/Gazelle.xs::_parse_http_request"
            }
          ],
          "repo": "https://github.com/kazeburo/Gazelle",
          "versions": [
            {
              "version": "0",
              "lessThanOrEqual": "0.49",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-06T14:14:25.637199Z",
          "id": "CVE-2026-40562",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-444"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "criteria": "cpe:2.3:a:kazeburo:gazelle:*:*:*:*:*:perl:*:*",
              "versionEndExcluding": "0.50",
              "matchCriteriaId": "F2360CF4-CAB8-4DC7-B595-C7501D7EC17C"
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  "references": [
    {
      "url": "https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
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      ]
    },
    {
      "url": "https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Patch"
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    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/05/06/7",
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ]
    }
  ]
}