{"id":"CVE-2026-53869","title":"Hermes Agent before 0.16.0 contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation","summary":"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/p…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-306"],"vendor":"NousResearch","product":"hermes-agent","affected":["hermes-agent < 0.16.0"],"patched":["hermes-agent 0.16.0"],"published":"2026-06-17","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:17:20.460","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53869","references":[{"url":"https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d92bb569fc3feb","label":"disclosure@vulncheck.com"},{"url":"https://github.com/NousResearch/hermes-agent/pull/30221","label":"disclosure@vulncheck.com"},{"url":"https://github.com/NousResearch/hermes-agent/pull/31685","label":"disclosure@vulncheck.com"},{"url":"https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/hermes-agent-dns-rebinding-bypass-via-websocket-endpoints","label":"disclosure@vulncheck.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53869"},{"url":"https://github.com/advisories/GHSA-4pqm-j46f-795x"}],"tags":["nvd","cve.org","ghsa","pip"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-06-18T15:28:51.075482Z"},"epss":0.00592,"epssPercentile":0.48095,"ecosystem":"pip","ingestedAt":"2026-06-29T14:31:47.160Z","slug":"CVE-2026-53869","body":"## Overview\n\nHermes 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-53869)\n\nAffected packages:\n\n- `hermes-agent < 0.16.0`\n\nPatched in:\n\n- `hermes-agent 0.16.0`\n\nSource: https://github.com/advisories/GHSA-4pqm-j46f-795x","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}