Nebula-mesh allows non-admin operators to disable webhook SSRF protection via `allow_private`

{
  "id": "7ab65dbacee656b99a653fff852b750e99b914e58fbb4cd672621ff4bb8bf4bb",
  "url": "https://osv.dev/vulnerability/CVE-2026-63464",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Nebula-mesh allows non-admin operators to disable webhook SSRF protection via `allow_private`",
    "summary": "nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. From version 0.6.0 to before version 0.7.2, non-admin operators (role user) can set allow_private: true on their own managed webhook subscription (POST/PATCH /api/v1/webhook-subscriptions). No admin check exists on this field. At delivery time, allow_private switches the dispatcher to an unguarded HTTP client, bypassing the private/loopback/link-local SSRF guard — letting a low-privilege operator make the server request internal addresses. This issue has been patched in version 0.7.2.",
    "evidence": "osv:CVE-2026-63464",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-63464",
      "aliases": [
        "CVE-2026-63464",
        "GHSA-7rx3-5wx3-5v76",
        "GO-2026-5985"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/forgekeep/nebula-mesh",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9487a7521c94b14973dcf67efb69faae5c8001e9"
                },
                {
                  "fixed": "65f3107f887648e23f3bf1a7c9ecc397d958c1ad"
                },
                {
                  "fixed": "f3c54530e388dd21763e548923426e60a8e93ff0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.6.0"
                      },
                      {
                        "fixed": "0.7.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f3c54530e388dd21763e548923426e60a8e93ff0"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "65f3107f887648e23f3bf1a7c9ecc397d958c1ad"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.7.2"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.7.1",
            "v0.7.0",
            "v0.6.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63464.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.929148918Z",
      "provider": "osv",
      "references": [
        "https://github.com/forgekeep/nebula-mesh/releases/tag/v0.7.2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63464.json",
        "https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-7rx3-5wx3-5v76",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-63464",
        "https://github.com/forgekeep/nebula-mesh/commit/f3c54530e388dd21763e548923426e60a8e93ff0"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862",
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63464.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-63464",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500997,
  "published_at": "2026-09-04T19:44:10.117+00:00"
}