{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.51.468"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "ce272d9cd5f8e5a4521278f56eb5388010901646"
            }
          ],
          "repo": "https://github.com/nesquena/hermes-webui",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55205.json"
  },
  "details": "Hermes WebUI before 0.51.468 contains a resource exhaustion vulnerability in the unauthenticated POST /api/onboarding/oauth/start endpoint that allows unbounded accumulation of in-memory flow state and daemon threads. Attackers can send repeated or concurrent requests to exhaust server memory and thread resources, potentially triggering repeated outbound device-code requests to upstream OAuth providers.",
  "id": "CVE-2026-55205",
  "modified": "2026-07-08T05:38:35.089032736Z",
  "published": "2026-06-18T15:49:04.786Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55205.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/nesquena/hermes-webui/releases/tag/v0.51.468"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55205"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/hermes-webui-resource-exhaustion-via-unauthenticated-oauth-flow-endpoint"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nesquena/hermes-webui/pull/3970"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nesquena/hermes-webui/pull/4338"
    },
    {
      "type": "FIX",
      "url": "https://github.com/nesquena/hermes-webui/commit/ce272d9cd5f8e5a4521278f56eb5388010901646"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nesquena/hermes-webui"
    }
  ],
  "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:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Hermes WebUI \u003c 0.51.468 - Resource Exhaustion via Unauthenticated OAuth Flow Endpoint"
}