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CVE-2026-33191

Estado: AnalizadaAlta (8.7)—

Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions prior to 1.4.2 are vulnerable to null byte injection in URL path parameters. A remote attacker can inject null bytes (URL-encoded as %00) into the supi path parameter of the UDM's Nudm_SubscriberDataManagement API. This causes URL parsing failure in Go's net/url package with the error "invalid control character in URL", resulting in a 500 Internal Server Error. This null byte injection vulnerability can be exploited for denial of service attacks.

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When the supi parameter contains null characters, the UDM attempts to construct a URL for UDR that includes these control characters. Go's URL parser rejects them, causing the request to fail with 500 instead of properly validating input and returning 400 Bad Request. This issue has been fixed in version 1.4.2.

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 remoto sin autenticación (AV:N/PR:N) a API expuesta; null byte injection causa 500 error → denegación de servicio por agotamiento de recursos.

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

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Free5gc — UDM

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-33191",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2026-33191",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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          "integrityImpact": "NONE",
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          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
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        "exploitabilityScore": 3.9
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          "attackVector": "NETWORK",
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          "valueDensity": "NOT_DEFINED",
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          "exploitMaturity": "NOT_DEFINED",
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          "modifiedAttackVector": "NOT_DEFINED",
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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  "published": "2026-03-20T08:16:12.597",
  "references": [
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      "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-p9hg-pq3q-v9gv",
      "tags": [
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        "Vendor Advisory"
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      "url": "https://github.com/free5gc/udm/commit/88de9fa74a1b3f3522e53b4cfa2d184712ffa4ee",
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      "description": [
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          "value": "CWE-158"
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          "value": "CWE-248"
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  "descriptions": [
    {
      "lang": "en",
      "value": "Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions prior to 1.4.2\nare vulnerable to null byte injection in URL path parameters. A remote attacker can inject null bytes (URL-encoded as %00) into the supi path parameter of the UDM's Nudm_SubscriberDataManagement API. This causes URL parsing failure in Go's net/url package with the error \"invalid control character in URL\", resulting in a 500 Internal Server Error. This null byte injection vulnerability can be exploited for denial of service attacks. When the supi parameter contains null characters, the UDM attempts to construct a URL for UDR that includes these control characters. Go's URL parser rejects them, causing the request to fail with 500 instead of properly validating input and returning 400 Bad Request. This issue has been fixed in version 1.4.2."
    },
    {
      "lang": "es",
      "value": "Free5GC es un proyecto de código abierto de la Linux Foundation para redes centrales móviles de quinta generación (5G). Las versiones anteriores a la 1.4.2 son vulnerables a la inyección de bytes nulos en los parámetros de ruta de URL. Un atacante remoto puede inyectar bytes nulos (codificados en URL como %00) en el parámetro de ruta supi de la API Nudm_SubscriberDataManagement del UDM. Esto causa un fallo en el análisis de URL en el paquete net/url de Go con el error 'invalid control character in URL', lo que resulta en un error 500 Internal Server Error. Esta vulnerabilidad de inyección de bytes nulos puede ser explotada para ataques de denegación de servicio. Cuando el parámetro supi contiene caracteres nulos, el UDM intenta construir una URL para UDR que incluye estos caracteres de control. El analizador de URL de Go los rechaza, lo que provoca que la solicitud falle con 500 en lugar de validar correctamente la entrada y devolver 400 Bad Request. Este problema ha sido solucionado en la versión 1.4.2."
    }
  ],
  "lastModified": "2026-06-17T10:37:06.163",
  "configurations": [
    {
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        {
          "negate": false,
          "cpeMatch": [
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