{"id":"CVE-2026-53869","title":"Hermes Agent contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation","summary":"Hermes Agent contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation","severity":"high","cvss":7.5,"cwe":["CWE-306"],"vendor":"hermes-agent","product":"hermes-agent","ecosystem":"pip","affected":["hermes-agent < 0.16.0"],"patched":["hermes-agent 0.16.0"],"published":"2026-06-17","updated":"2026-06-19","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-4pqm-j46f-795x","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53869"},{"url":"https://github.com/NousResearch/hermes-agent/pull/30221"},{"url":"https://github.com/NousResearch/hermes-agent/pull/31685"},{"url":"https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d92bb569fc3feb"},{"url":"https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5"},{"url":"https://www.vulncheck.com/advisories/hermes-agent-dns-rebinding-bypass-via-websocket-endpoints"},{"url":"https://github.com/advisories/GHSA-4pqm-j46f-795x"}],"tags":["ghsa","pip"],"epss":0.00592,"epssPercentile":0.47008,"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## Affected packages\n\n- `hermes-agent < 0.16.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `hermes-agent 0.16.0`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}