{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33064", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-17T19:27:06.343Z", "datePublished": "2026-03-20T08:00:31.755Z", "dateUpdated": "2026-03-20T15:42:53.709Z"}, "containers": {"cna": {"title": "free5GC UDM DataChangeNotification Procedure Panic Due to Nil Pointer Dereference", "problemTypes": [{"descriptions": [{"cweId": "CWE-478", "lang": "en", "description": "CWE-478: Missing Default Case in Multiple Condition Expression", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH", "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", "version": "4.0"}}], "references": [{"name": "https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75"}, {"name": "https://github.com/free5gc/free5gc/issues/781", "tags": ["x_refsource_MISC"], "url": "https://github.com/free5gc/free5gc/issues/781"}, {"name": "https://github.com/free5gc/udm/pull/78", "tags": ["x_refsource_MISC"], "url": "https://github.com/free5gc/udm/pull/78"}, {"name": "https://github.com/free5gc/udm/commit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92", "tags": ["x_refsource_MISC"], "url": "https://github.com/free5gc/udm/commit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92"}], "affected": [{"vendor": "free5gc", "product": "free5gc", "versions": [{"version": "< 1.4.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-20T08:00:31.755Z"}, "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 are vulnerable to procedure panic caused by Nil Pointer Dereference in the /sdm-subscriptions endpoint. A remote attacker can cause the UDM service to panic and crash by sending a crafted POST request to the /sdm-subscriptions endpoint with a malformed URL path containing path traversal sequences (../) and a large JSON payload. The DataChangeNotificationProcedure function in notifier.go attempts to access a nil pointer without proper validation, causing a complete service crash with \"runtime error: invalid memory address or nil pointer dereference\". Exploitation would result in UDM functionality disruption until recovery by restart. This issue has been fixed in version 1.4.2."}], "source": {"advisory": "GHSA-7g27-v5wj-jr75", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-20T15:42:37.002784Z", "id": "CVE-2026-33064", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-20T15:42:53.709Z"}}]}}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.4.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "free5gc", "source": "cna", "vendor": "free5gc"}, "product": "free5gc", "vendor": "free5gc"}], "analysis": {"en": {"generated_at": "2026-03-20T09:27:00.190410+00:00", "value": {"mitigation_remediation": ["Apply the official upgrade to free5GC UDM version 1.4.2 or later."], "summary": {"action": "Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Free5GC UDM versions prior to 1.4.2 are affected. The vendor product free5gc:free5gc is impacted. The vulnerability was discovered in commits leading up to the 1.4.2 release and has been fixed in that version.", "description_and_impact": "The vulnerability resides in the DataChangeNotificationProcedure function within free5GC UDM's notifier.go. A nil pointer dereference occurs when processing requests to the /sdm-subscriptions endpoint. An attacker can send a crafted POST request that contains path traversal sequences (../) and a large JSON payload, triggering a runtime panic and crashing the UDM service. The impact is a loss of UDM functionality, resulting in a denial of service until the application is restarted. The weakness corresponds to CWE-478.", "risk_and_exploitability": "CVSS v3.1 score 8.7 indicates high severity. The EPSS score is not available, so the exact likelihood of exploitation is unknown. The vulnerability is not listed in CISA's KEV catalog. A remote attacker who can reach the UDM service can send a malformed POST request to the /sdm-subscriptions endpoint, causing a panic. No authentication is required, and the attack can occur over any network path exposed to the UDM service."}}}}, "created": "2026-03-20T10:36:49.633013+00:00", "updated": "2026-03-20T16:27:54.448337+00:00", "vendors": ["free5gc", "free5gc$PRODUCT$free5gc"]}