CVE-2026-33062

free5GC is an open source 5G core network. free5GC NRF prior to version 1.4.2 has an Improper Input Validation vulnerability leading to Denial of Service. All deployments of free5GC using the NRF discovery service are affected. The `EncodeGroupId` function attempts to access array indices [0], [1], [2] without validating the length of the split data. When the parameter contains insufficient separator characters, the code panics with "index out of range". A remote attacker can cause the NRF service to panic and crash by sending a crafted HTTP GET request with a malformed `group-id-list` parameter. This results in complete denial of service for the NRF discovery service. free5GC NRF version 1.4.2 fixes the issue. There is no direct workaround at the application level. The recommendation is to apply the provided patch or restrict access to the NRF API to trusted sources only.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/free5gc/free5gc/issues/777	Issue Tracking Exploit
https://github.com/free5gc/free5gc/security/advisories/GHSA-7c47-xr7q-p6hg	Vendor Advisory
https://github.com/free5gc/nrf/commit/dac77d8f8f2e0f041c5634fb3c685dcb9734b872	Patch
https://github.com/free5gc/nrf/pull/80	Patch

Configurations

Configuration 1 (hide)

cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-20 03:16

Updated : 2026-03-27 17:13

NVD link : CVE-2026-33062

Mitre link : CVE-2026-33062

CVE.ORG link : CVE-2026-33062

JSON object : View

Products Affected

free5gc

free5gc

CWE

CWE-284

Improper Access Control

NVD-CWE-noinfo

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All deployments of free5GC using the NRF discovery service are affected. The `EncodeGroupId` function attempts to access array indices [0], [1], [2] without validating the length of the split data. When the parameter contains insufficient separator characters, the code panics with \"index out of range\". A remote attacker can cause the NRF service to panic and crash by sending a crafted HTTP GET request with a malformed `group-id-list` parameter. This results in complete denial of service for the NRF discovery service. free5GC NRF version 1.4.2 fixes the issue. There is no direct workaround at the application level. The recommendation is to apply the provided patch or restrict access to the NRF API to trusted sources only."}, {"lang": "es", "value": "free5GC es una red central 5G de c\u00f3digo abierto. free5GC NRF anterior a la versi\u00f3n 1.4.2 tiene una vulnerabilidad de validaci\u00f3n de entrada incorrecta que conduce a denegaci\u00f3n de servicio. Todas las implementaciones de free5GC que utilizan el servicio de descubrimiento NRF est\u00e1n afectadas. La funci\u00f3n 'EncodeGroupId' intenta acceder a los \u00edndices de la matriz [0], [1], [2] sin validar la longitud de los datos divididos. Cuando el par\u00e1metro contiene caracteres separadores insuficientes, el c\u00f3digo entra en p\u00e1nico con 'index out of range'. Un atacante remoto puede hacer que el servicio NRF entre en p\u00e1nico y falle al enviar una solicitud HTTP GET manipulada con un par\u00e1metro 'group-id-list' malformado. Esto resulta en una denegaci\u00f3n de servicio completa para el servicio de descubrimiento NRF. free5GC NRF versi\u00f3n 1.4.2 corrige el problema. No hay una soluci\u00f3n alternativa directa a nivel de aplicaci\u00f3n. La recomendaci\u00f3n es aplicar el parche proporcionado o restringir el acceso a la API NRF solo a fuentes confiables."}], "lastModified": "2026-03-27T17:13:12.013", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F7D53A8E-777B-4DD7-898E-7EE90ED6D37A", "versionEndExcluding": "1.4.2"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}