{"id":"GHSA-4pqm-j46f-795x","summary":"Hermes Agent contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation","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.","aliases":["CVE-2026-53869","PYSEC-2026-2510"],"modified":"2026-07-13T16:42:59.391382989Z","published":"2026-06-17T21:34:38Z","database_specific":{"nvd_published_at":"2026-06-17T19:18:10Z","cwe_ids":["CWE-306"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-06-19T14:47:03Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53869"},{"type":"WEB","url":"https://github.com/NousResearch/hermes-agent/pull/30221"},{"type":"WEB","url":"https://github.com/NousResearch/hermes-agent/pull/31685"},{"type":"WEB","url":"https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d92bb569fc3feb"},{"type":"PACKAGE","url":"https://github.com/NousResearch/hermes-agent"},{"type":"WEB","url":"https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/hermes-agent-dns-rebinding-bypass-via-websocket-endpoints"}],"affected":[{"package":{"name":"hermes-agent","ecosystem":"PyPI","purl":"pkg:pypi/hermes-agent"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.16.0"}]}],"versions":["0.13.0","0.14.0","0.15.0","0.15.1","0.15.2"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-4pqm-j46f-795x/GHSA-4pqm-j46f-795x.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","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"}]}