Empty API_TOKEN disables authentication on network-reachable HTTP/SSE transport

{
  "id": "795e6057b4f85898a6b0093db3c3aceba2f6813480bc09110f8601c2830096de",
  "url": "https://osv.dev/vulnerability/CVE-2026-44830",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Empty API_TOKEN disables authentication on network-reachable HTTP/SSE transport",
    "summary": "Nocturne Memory is a lightweight, rollbackable, and visual Long-Term Memory Server for MCP Agents. Prior to 2.4.1, when API_TOKEN is unset or empty, the BearerTokenAuthMiddleware bypasses authentication for all HTTP requests. Combined with the default 0.0.0.0 host binding and CORS allow_origins=[\"*\"], operators following the Docker setup without explicitly setting API_TOKEN expose the full Knowledge-Graph read/write API to any LAN-reachable client. An attacker on the same network can read, write, or delete all memory entries — including system://boot and core://* URIs that auto-load into downstream agent sessions, enabling persistent prompt-injection. This vulnerability is fixed in 2.4.1.",
    "evidence": "osv:CVE-2026-44830",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-44830",
      "aliases": [
        "CVE-2026-44830",
        "GHSA-crr4-xrj9-ww8g"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/dataojitori/nocturne_memory",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "ce6465e74902e5d8fd7ba339a498ce9d8e5527f1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.4.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.4.1"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.4.0",
            "2.3.0",
            "2.2.0",
            "2.1.1",
            "2.0.1",
            "2.0.0",
            "1.3.2",
            "1.3.1",
            "1.3.0",
            "v1.2.0",
            "v1.1.4",
            "v1.1.3",
            "v1.1.2",
            "v1.1.1",
            "v1.1.0",
            "v1.0.4",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0",
            "v0.9.0-legacy"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44830.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:35.682840331Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44830.json",
        "https://github.com/Dataojitori/nocturne_memory/security/advisories/GHSA-crr4-xrj9-ww8g",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44830"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-306"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44830.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44830",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 502996,
  "published_at": "2026-05-27T14:19:55.126+00:00"
}