CVE-2026-42081

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{"affected": [{"affectedData": [{"product": "free5gc", "vendor": "free5gc", "versions": [{"status": "affected", "version": "< 4.2.2"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*", "matchCriteriaId": "EF7EBB95-EB4E-44C5-BF0A-9C99B0A7775F", "versionEndExcluding": "4.2.2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the AMF in Free5GC does not verify the UE Security Capabilities received in NGAP PathSwitchRequest messages against its locally stored values, as mandated by 3GPP TS 33.501 \u00a76.7.3.1. A malicious gNB can overwrite the AMF's stored UE security capabilities with arbitrary values, which are then propagated in PathSwitchRequest Acknowledge messages and subsequent Handover Request messages. This leads to persistent handover denial-of-service for affected UEs. This vulnerability is fixed in 4.2.2."}, {"lang": "es", "value": "free5GC es una implementaci\u00f3n de c\u00f3digo abierto de la red central 5G. Antes de 4.2.2, el AMF en Free5GC no verifica las Capacidades de Seguridad del UE recibidas en los mensajes NGAP PathSwitchRequest contra sus valores almacenados localmente, seg\u00fan lo exigido por 3GPP TS 33.501 \u00a76.7.3.1. Un gNB malicioso puede sobrescribir las capacidades de seguridad del UE almacenadas en el AMF con valores arbitrarios, los cuales son luego propagados en los mensajes PathSwitchRequest Acknowledge y en los mensajes Handover Request subsiguientes. Esto conduce a una denegaci\u00f3n de servicio de traspaso persistente para los UEs afectados. Esta vulnerabilidad est\u00e1 corregida en 4.2.2."}], "id": "CVE-2026-42081", "lastModified": "2026-10-14T20:10:00.190", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "LOW", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42081", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-27T17:55:46.681829Z", "version": "2.0.3"}}]}, "published": "2026-05-27T17:16:34.967", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-77x9-rf64-92gv"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-77x9-rf64-92gv"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-358"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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