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CVE-2026-34715

Estado: AnalizadaMedia (5.3)—

ewe is a Gleam web server. Prior to version 3.0.6, the encode_headers function in src/ewe/internal/encoder.gleam directly interpolates response header keys and values into raw HTTP bytes without validating or stripping CRLF (\r\n) sequences. An application that passes user-controlled data into response headers (e.g., setting a Location redirect header from a request parameter) allows an attacker to inject arbitrary HTTP response content, leading to response splitting, cache poisoning, and possible cross-site scripting. Notably, ewe does validate CRLF in incoming request headers via validate_field_value() in the HTTP/1.1 parser — but provides no equivalent protection for outgoing response headers in the encoder. This issue has been patched in version 3.0.6.

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)

Vshakitskiy — EWE

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-34715",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-34715",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-03T16:00:11.591060Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
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  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
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          "vendor": "vshakitskiy",
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          "versions": [
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              "status": "affected",
              "version": "< 3.0.6"
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  "published": "2026-04-02T18:16:32.910",
  "references": [
    {
      "url": "https://github.com/vshakitskiy/ewe/commit/ce4ff214d32626a10fda9398dc94a2d720e17446",
      "tags": [
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      "url": "https://github.com/vshakitskiy/ewe/releases/tag/v3.0.6",
      "tags": [
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        "Release Notes"
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    {
      "url": "https://github.com/vshakitskiy/ewe/security/advisories/GHSA-x2w3-23jr-hrpf",
      "tags": [
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        "Vendor Advisory"
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    {
      "url": "https://github.com/vshakitskiy/ewe/security/advisories/GHSA-x2w3-23jr-hrpf",
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        "Vendor Advisory"
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
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      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-113"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "ewe is a Gleam web server. Prior to version 3.0.6, the encode_headers function in src/ewe/internal/encoder.gleam directly interpolates response header keys and values into raw HTTP bytes without validating or stripping CRLF (\\r\\n) sequences. An application that passes user-controlled data into response headers (e.g., setting a Location redirect header from a request parameter) allows an attacker to inject arbitrary HTTP response content, leading to response splitting, cache poisoning, and possible cross-site scripting. Notably, ewe does validate CRLF in incoming request headers via validate_field_value() in the HTTP/1.1 parser — but provides no equivalent protection for outgoing response headers in the encoder. This issue has been patched in version 3.0.6."
    },
    {
      "lang": "es",
      "value": "ewe es un servidor web Gleam. Antes de la versión 3.0.6, la función encode_headers en src/ewe/internal/encoder.gleam interpola directamente las claves y valores de los encabezados de respuesta en bytes HTTP sin procesar sin validar o eliminar las secuencias CRLF (\\r\\n). Una aplicación que pasa datos controlados por el usuario a los encabezados de respuesta (por ejemplo, estableciendo un encabezado de redirección Location a partir de un parámetro de solicitud) permite a un atacante inyectar contenido de respuesta HTTP arbitrario, lo que lleva a la división de respuesta, envenenamiento de caché y posible cross-site scripting. Cabe destacar que ewe sí valida CRLF en los encabezados de solicitud entrantes a través de validate_field_value() en el analizador HTTP/1.1 - pero no proporciona protección equivalente para los encabezados de respuesta salientes en el codificador. Este problema ha sido parcheado en la versión 3.0.6."
    }
  ],
  "lastModified": "2026-07-24T21:10:00.143",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:vshakitskiy:ewe:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B2FC5C49-3780-4196-A493-57F172153863",
              "versionEndExcluding": "3.0.6"
            }
          ],
          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}