{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "d9ec90585cf7616b5972e44cf8d92bb569fc3feb"
            },
            {
              "fixed": "3c231eb3979ab9c57d5cd6d02f1d577a3b718b43"
            }
          ],
          "repo": "https://github.com/nousresearch/hermes-agent",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-306"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53869.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "0.16.0"
          }
        ],
        "source": "AFFECTED_FIELD"
      },
      {
        "extracted_events": [
          {
            "fixed": "0.16.0"
          }
        ],
        "source": "DESCRIPTION"
      }
    ]
  },
  "details": "Hermes Agent before 0.16.0 contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation. FastAPI HTTP middleware does not execute for WebSocket upgrade requests on /api/pty, /api/ws, /api/pub, and /api/events endpoints, enabling attackers to exploit DNS rebinding and inject malicious commands or read terminal output.",
  "id": "CVE-2026-53869",
  "modified": "2026-07-08T05:36:35.000897405Z",
  "published": "2026-06-17T17:57:30.978Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53869.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53869"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/hermes-agent-dns-rebinding-bypass-via-websocket-endpoints"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/NousResearch/hermes-agent/pull/30221"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/NousResearch/hermes-agent/pull/31685"
    },
    {
      "type": "FIX",
      "url": "https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d92bb569fc3feb"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/NousResearch/hermes-agent"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Hermes Agent \u003c 0.16.0 - DNS Rebinding Bypass via WebSocket Endpoints"
}