Open5GS SGWC s5c-handler.c sgwc_s5c_handle_modify_bearer_response denial of service

{
  "id": "6a19cff018ec381686a14670b773dddc32cb3c020c119b38aa6e8967a951f0e1",
  "url": "https://osv.dev/vulnerability/CVE-2026-1522",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Open5GS SGWC s5c-handler.c sgwc_s5c_handle_modify_bearer_response denial of service",
    "summary": "A weakness has been identified in Open5GS up to 2.7.6. This vulnerability affects the function sgwc_s5c_handle_modify_bearer_response of the file src/sgwc/s5c-handler.c of the component SGWC. Executing a manipulation can lead to denial of service. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks. This patch is called b19cf6a. Applying a patch is advised to resolve this issue. The issue report is flagged as already-fixed.",
    "evidence": "osv:CVE-2026-1522",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-1522",
      "aliases": [
        "CVE-2026-1522"
      ],
      "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:P"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/open5gs/open5gs",
              "type": "GIT",
              "events": [
                {
                  "introduced": "83e35bb2de7e67646fdba849580184422b10006a"
                },
                {
                  "fixed": "b19cf6a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.7.0"
                      },
                      {
                        "last_affected": "2.7.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "2.7.1"
                      },
                      {
                        "last_affected": "2.7.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "2.7.2"
                      },
                      {
                        "last_affected": "2.7.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "2.7.5"
                      },
                      {
                        "last_affected": "2.7.5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "2.7.6"
                      },
                      {
                        "last_affected": "2.7.6"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "fixed": "b19cf6a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.7.0",
            "2.7.1",
            "2.7.2",
            "2.7.5",
            "2.7.6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-1522.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.333859522Z",
      "provider": "osv",
      "references": [
        "https://github.com/open5gs/open5gs/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1522.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-1522",
        "https://vuldb.com/?id.343193",
        "https://vuldb.com/?submit.738371",
        "https://github.com/open5gs/open5gs/issues/4266",
        "https://github.com/open5gs/open5gs/issues/4266#event-21968568116",
        "https://github.com/open5gs/open5gs/issues/4266#issue-3794991595",
        "https://vuldb.com/?ctiid.343193",
        "https://github.com/open5gs/open5gs/commit/b19cf6a"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-404"
        ],
        "cna_assigner": "VulDB",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "2.7.3"
                  },
                  {
                    "last_affected": "2.7.3"
                  },
                  {
                    "introduced": "2.7.4"
                  },
                  {
                    "last_affected": "2.7.4"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandaloneSingleVersion"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1522.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-1522",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496202,
  "published_at": "2026-01-28T16:32:07.267+00:00"
}