Free5GC AMF handler.go HandleRegistrationComplete denial of service

{
  "id": "c26edf5e8b045200d92382ac644d0c753bac1d6fb8322647d3382f1ebb13cc13",
  "url": "https://osv.dev/vulnerability/CVE-2026-4531",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Free5GC AMF handler.go HandleRegistrationComplete denial of service",
    "summary": "A weakness has been identified in Free5GC 4.1.0. Affected is the function HandleRegistrationComplete of the file internal/gmm/handler.go of the component AMF. Executing a manipulation can lead to denial of service. The attack may be performed from remote. This patch is called 52e9386401ce56ea773c5aa587d4cdf7d53da799. It is best practice to apply a patch to resolve this issue.",
    "evidence": "osv:CVE-2026-4531",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-4531",
      "aliases": [
        "CVE-2026-4531",
        "GHSA-xq44-64rg-8g3h",
        "GO-2026-5767"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/free5gc/amf",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "52e9386401ce56ea773c5aa587d4cdf7d53da799"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "52e9386401ce56ea773c5aa587d4cdf7d53da799"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            },
            {
              "repo": "https://github.com/free5gc/free5gc",
              "type": "GIT",
              "events": [
                {
                  "introduced": "de6bdb7a0d5963266c893cca59c86f55df348f57"
                },
                {
                  "last_affected": "de6bdb7a0d5963266c893cca59c86f55df348f57"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "4.1.0"
                      },
                      {
                        "last_affected": "4.1.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.1.0",
            "v1.4.2",
            "v1.4.1",
            "v1.4.0",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.7",
            "v1.2.6",
            "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",
            "v4.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4531.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.094261123Z",
      "provider": "osv",
      "references": [
        "https://github.com/free5gc/free5gc/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4531.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-4531",
        "https://vuldb.com/?id.352319",
        "https://vuldb.com/?submit.774073",
        "https://github.com/free5gc/free5gc/issues/792",
        "https://vuldb.com/?ctiid.352319",
        "https://github.com/free5gc/amf/commit/52e9386401ce56ea773c5aa587d4cdf7d53da799",
        "https://github.com/free5gc/amf/pull/198"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-404"
        ],
        "cna_assigner": "VulDB",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4531.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-4531",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500014,
  "published_at": "2026-03-22T01:32:11.642+00:00"
}