{"id":"PYSEC-2026-2510","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","GHSA-4pqm-j46f-795x"],"modified":"2026-07-13T16:31:57.054858358Z","published":"2026-07-13T15:46:20.346348Z","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"},{"type":"PACKAGE","url":"https://pypi.org/project/hermes-agent"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-4pqm-j46f-795x"}],"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/pypa/advisory-database/blob/main/vulns/hermes-agent/PYSEC-2026-2510.yaml"}}],"schema_version":"1.7.5","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"}]}