{"id":"CVE-2026-33064","summary":"free5GC UDM DataChangeNotification Procedure Panic Due to Nil Pointer Dereference","details":"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.","aliases":["GHSA-7g27-v5wj-jr75","GO-2026-4757"],"modified":"2026-07-15T01:49:00.759221556Z","published":"2026-03-20T08:00:31.755Z","related":["SUSE-SU-2026:1135-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33064.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-478"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33064.json"},{"type":"ADVISORY","url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33064"},{"type":"REPORT","url":"https://github.com/free5gc/free5gc/issues/781"},{"type":"FIX","url":"https://github.com/free5gc/udm/commit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92"},{"type":"FIX","url":"https://github.com/free5gc/udm/pull/78"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/free5gc/udm","events":[{"introduced":"0"},{"fixed":"65d7070f4bfd016864cbbaefbd506bbc85d2fa92"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.4.2"}],"source":["AFFECTED_FIELD","CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:free5gc:udm:*:*:*:*:*:go:*:*"}}],"versions":["v1.4.1","v1.4.0","v1.3.2","v1.3.1","v1.3.0","v1.2.5","v1.2.4","v1.2.3","v1.2.2","v1.2.1","v1.2.0","v1.1.1","v1.1.0","v1.0.2","v1.0.1","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33064.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"}]}