CVE-2026-33805

Estado: ModificadaCrítica (9)—

@fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client's Connection header after the proxy has added its own headers via rewriteRequestHeaders. This allows attackers to retroactively strip proxy-added headers from upstream requests by listing them in the Connection header value. Any header added by the proxy for routing, access control, or security purposes can be selectively removed by a client. @fastify/http-proxy is also affected as it delegates to @fastify/reply-from.

Upgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later.

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/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
Puntuación base: 9

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.56%
Percentil entre todas las CVEs puntuadas: 45
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access85 %
Impacto principalT1565.002 Transmitted Data Manipulationimpact80 %
Impacto secundarioT1090.004 Domain Frontingcommand and control75 %

Vulnerabilidad de red remota sin autenticación (AV:N/PR:N) que permite manipular cabeceras HTTP proxy eliminando controles de seguridad; se altera el flujo de solicitudes y se pueden eludir restricciones de acceso.

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 Scanning SSL/TLS Inspection Privileged Account Management Network Segmentation Limit Access to Resource Over Network Filter Network Traffic

Tecnologías afectadas (2)

Fastify — Fastify/http-proxy Fastify — Reply-from

CWE

CWE-644
CWE-444

Referencias

JSON original (NVD)

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  "id": "CVE-2026-33805",
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          "modifiedAttackRequirements": "NOT_DEFINED",
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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      "url": "https://cna.openjsf.org/security-advisories.html",
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        "Vendor Advisory"
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
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    {
      "lang": "en",
      "value": "@fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client's Connection header after the proxy has added its own headers via rewriteRequestHeaders. This allows attackers to retroactively strip proxy-added headers from upstream requests by listing them in the Connection header value. Any header added by the proxy for routing, access control, or security purposes can be selectively removed by a client. @fastify/http-proxy is also affected as it delegates to @fastify/reply-from. \n\nUpgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later."
    }
  ],
  "lastModified": "2026-07-15T02:20:15.547",
  "configurations": [
    {
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        {
          "negate": false,
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              "criteria": "cpe:2.3:a:fastify:fastify\\/http-proxy:*:*:*:*:*:node.js:*:*",
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}