free5GC UDM DataChangeNotification Procedure Panic Due to Nil Pointer Dereference

{
  "id": "231d8c1e59ee43f717d9964c860a48cd1cc8f769eaee049997f0ff25ee62c32c",
  "url": "https://osv.dev/vulnerability/CVE-2026-33064",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "free5GC UDM DataChangeNotification Procedure Panic Due to Nil Pointer Dereference",
    "summary": "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.",
    "evidence": "osv:CVE-2026-33064",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-33064",
      "aliases": [
        "CVE-2026-33064",
        "GHSA-7g27-v5wj-jr75",
        "GO-2026-4757"
      ],
      "metrics": [
        {
          "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/free5gc/udm",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "65d7070f4bfd016864cbbaefbd506bbc85d2fa92"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.4.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "65d7070f4bfd016864cbbaefbd506bbc85d2fa92"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "cpe": "cpe:2.3:a:free5gc:udm:*:*:*:*:*:go:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.4.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "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"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.567891808Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33064.json",
        "https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-33064",
        "https://github.com/free5gc/free5gc/issues/781",
        "https://github.com/free5gc/udm/commit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92",
        "https://github.com/free5gc/udm/pull/78"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-478"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33064.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-33064",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490072,
  "published_at": "2026-03-20T08:00:31.755+00:00"
}