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CVE-2024-42353

Estado: AnalizadaMedia (6.1)—

WebOb provides objects for HTTP requests and responses. When WebOb normalizes the HTTP Location header to include the request hostname, it does so by parsing the URL that the user is to be redirected to with Python's urlparse, and joining it to the base URL. `urlparse` however treats a `//` at the start of a string as a URI without a scheme, and then treats the next part as the hostname. `urljoin` will then use that hostname from the second part as the hostname replacing the original one from the request. This vulnerability is patched in WebOb version 1.8.8.

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)

Pylonsproject — Webob

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2024-42353",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-42353",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-08-15T14:02:15.377428Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "CHANGED",
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          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
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        "impactScore": 2.7,
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      "affectedData": [
        {
          "vendor": "Pylons",
          "product": "webob",
          "versions": [
            {
              "status": "affected",
              "version": "<= 1.8.7"
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  "published": "2024-08-14T21:15:17.073",
  "references": [
    {
      "url": "https://github.com/Pylons/webob/commit/f689bcf4f0a1f64f1735b1d5069aef5be6974b5b",
      "tags": [
        "Patch"
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      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/Pylons/webob/security/advisories/GHSA-mg3v-6m49-jhp3",
      "tags": [
        "Exploit",
        "Vendor Advisory"
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      "source": "security-advisories@github.com"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
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          "lang": "en",
          "value": "CWE-601"
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      ]
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    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-601"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "WebOb provides objects for HTTP requests and responses. When WebOb normalizes the HTTP Location header to include the request hostname, it does so by parsing the URL that the user is to be redirected to with Python's urlparse, and joining it to the base URL. `urlparse` however treats a `//` at the start of a string as a URI without a scheme, and then treats the next part as the hostname. `urljoin` will then use that hostname from the second part as the hostname replacing the original one from the request. This vulnerability is patched in WebOb version 1.8.8."
    },
    {
      "lang": "es",
      "value": "WebOb proporciona objetos para solicitudes y respuestas HTTP. Cuando WebOb normaliza el encabezado de Ubicación HTTP para incluir el nombre de host de la solicitud, lo hace analizando la URL a la que se redirigirá al usuario con urlparse de Python y uniéndola a la URL base. Sin embargo, `urlparse` trata un `//` al comienzo de una cadena como un URI sin un esquema, y luego trata la siguiente parte como el nombre de host. `urljoin` luego usará ese nombre de host de la segunda parte como nombre de host reemplazando el original de la solicitud. Esta vulnerabilidad está parcheada en WebOb versión 1.8.8."
    }
  ],
  "lastModified": "2026-06-17T07:49:18.797",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:pylonsproject:webob:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "1.8.8"
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          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}