{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "2.0.30"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "f4db521214c29337164ec788bafede7eab236c25"
            }
          ],
          "repo": "https://github.com/memtensor/memos",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-697"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75110.json"
  },
  "details": "MemOS is a memory operating system for LLMs and AI agents. In deployments where authentication is enabled (AUTH_ENABLED=true) but the undocumented, defaultless INTERNAL_SERVICE_SECRET environment variable is unset, the is_internal_request() check in src/memos/api/middleware/auth.py fails open: os.getenv(\"INTERNAL_SERVICE_SECRET\") returns None and a request omitting the X-Internal-Service header also yields None, so the comparison None == None evaluates true. The request is then treated as a trusted internal principal and granted scopes: [\"all\"]. As a result, an unauthenticated remote attacker can reach the admin API-key management endpoints to mint API keys for any user, enumerate keys, revoke keys, and generate a master key for persistent privileged access, as well as all data endpoints.",
  "id": "CVE-2026-75110",
  "modified": "2026-08-20T03:30:11.956523787Z",
  "published": "2026-08-17T20:36:04.095Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75110.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75110"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/memos-authentication-bypass-via-unset-internal-service-secret"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/MemTensor/MemOS/issues/2259"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/MemTensor/MemOS"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/MemTensor/MemOS/blob/main/src/memos/api/middleware/auth.py"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "MemOS Authentication Bypass via Unset INTERNAL_SERVICE_SECRET"
}