CVE-2026-53869

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-17. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.5
EG Score
7.5(high)
EPSS
44.4%
KEV
Not listed

Published

June 17, 2026

Last Modified

June 18, 2026

Advisory Details (5)

Auto-updated Jun 17, 2026
Patch available. Sources: github_commit, github_pr, github_release.
generic

Hermes Agent < 0.16.0 - DNS Rebinding Bypass via WebSocket Endpoints | Advisories | VulnCheck

https://www.vulncheck.com/advisories/hermes-agent-dns-rebinding-bypass-via-websocket-endpoints
github_release Patch Available

Hermes Agent v0.16.0 (2026.6.5) — The Surface Release

Patch available: NousResearch/hermes-agent v2026.6.5

https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5
github_pr

fix(dashboard): validate WebSocket Host and Origin (salvage #30221)

Fix merged in NousResearch/hermes-agent PR #31685 on 2026-05-24 — awaiting tagged release

https://github.com/NousResearch/hermes-agent/pull/31685
github_pr

[security] fix(dashboard): validate WebSocket Host and Origin

Upstream fix in progress (PR #30221 · NousResearch/hermes-agent, state=closed)

https://github.com/NousResearch/hermes-agent/pull/30221
github_commit

commit d9ec90585cf7 (NousResearch/hermes-agent)

Fix landed in NousResearch/hermes-agent commit d9ec90585cf7 — awaiting tagged release

https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d92bb569fc3feb

Vendor Advisories for CVE-2026-53869(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
hermes-agent0.13.0, 0.14.0, 0.15.0, 0.15.1, 0.15.20.16.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 25× in last 7d / 77× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 23:07 UTCEG score recompute
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 12:17 UTCEG score recompute
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-06 00:10 UTCEG score recompute
  8. 2026-07-05 13:14 UTCEG score recompute
  9. 2026-07-05 02:31 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-05 02:22 UTCEG score recompute
  12. 2026-07-04 15:31 UTCEG score recompute
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-04 04:41 UTCEG score recompute
  16. 2026-07-03 17:23 UTCEG score recompute
  17. 2026-07-03 06:31 UTCEG score recompute
  18. 2026-07-02 19:33 UTCEG score recompute
  19. 2026-07-02 08:43 UTCEG score recompute
  20. 2026-07-01 21:50 UTCEG score recompute
  21. 2026-07-01 15:07 UTCEPSS rescore
  22. 2026-07-01 10:59 UTCEG score recompute
  23. 2026-07-01 00:09 UTCEG score recompute
  24. 2026-06-30 23:22 UTCEPSS rescore
  25. 2026-06-30 13:11 UTCEG score recompute
Show 52 more
  1. 2026-06-30 02:20 UTCEG score recompute
  2. 2026-06-29 15:29 UTCEG score recompute
  3. 2026-06-29 14:06 UTCEPSS rescore
  4. 2026-06-29 14:06 UTCEPSS rescore
  5. 2026-06-29 04:31 UTCEG score recompute
  6. 2026-06-28 17:41 UTCEG score recompute
  7. 2026-06-28 14:07 UTCEPSS rescore
  8. 2026-06-28 06:50 UTCEG score recompute
  9. 2026-06-28 04:56 UTCEPSS rescore
  10. 2026-06-28 04:56 UTCEPSS rescore
  11. 2026-06-27 20:00 UTCEG score recompute
  12. 2026-06-27 09:09 UTCEG score recompute
  13. 2026-06-27 03:08 UTCEPSS rescore
  14. 2026-06-26 22:18 UTCEG score recompute
  15. 2026-06-26 11:27 UTCEG score recompute
  16. 2026-06-25 23:38 UTCEG score recompute
  17. 2026-06-25 13:49 UTCEPSS rescore
  18. 2026-06-25 12:47 UTCEG score recompute
  19. 2026-06-25 01:56 UTCEG score recompute
  20. 2026-06-24 15:06 UTCEG score recompute
  21. 2026-06-24 14:05 UTCEPSS rescore
  22. 2026-06-24 04:16 UTCEG score recompute
  23. 2026-06-23 21:33 UTCEPSS rescore
  24. 2026-06-23 21:33 UTCEPSS rescore
  25. 2026-06-23 17:09 UTCEG score recompute
  26. 2026-06-23 06:16 UTCEG score recompute
  27. 2026-06-22 19:23 UTCEG score recompute
  28. 2026-06-22 14:25 UTCEPSS rescore
  29. 2026-06-22 14:25 UTCEPSS rescore
  30. 2026-06-22 08:31 UTCEG score recompute
  31. 2026-06-21 21:40 UTCEG score recompute
  32. 2026-06-21 14:56 UTCEPSS rescore
  33. 2026-06-21 14:56 UTCEPSS rescore
  34. 2026-06-21 10:49 UTCEG score recompute
  35. 2026-06-21 01:59 UTCEPSS rescore
  36. 2026-06-21 01:59 UTCEPSS rescore
  37. 2026-06-20 23:57 UTCEG score recompute
  38. 2026-06-20 13:05 UTCEG score recompute
  39. 2026-06-20 02:14 UTCEG score recompute
  40. 2026-06-19 19:26 UTCEPSS rescore
  41. 2026-06-19 19:26 UTCEPSS rescore
  42. 2026-06-19 15:23 UTCEG score recompute
  43. 2026-06-19 04:32 UTCEG score recompute
  44. 2026-06-19 04:32 UTCGHSA enrichment
  45. 2026-06-18 17:52 UTCEPSS rescore
  46. 2026-06-18 17:52 UTCEPSS rescore
  47. 2026-06-18 17:40 UTCEG score recompute
  48. 2026-06-18 17:39 UTCGHSA enrichment
  49. 2026-06-18 06:45 UTCEG score recompute
  50. 2026-06-18 06:44 UTCGHSA enrichment
  51. 2026-06-17 19:51 UTCEG score recompute
  52. 2026-06-17 19:50 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-53869?
CVE-2026-53869 is a high vulnerability published on June 17, 2026. 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…
When was CVE-2026-53869 disclosed?
CVE-2026-53869 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on June 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53869 actively exploited?
CVE-2026-53869 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 44.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-53869?
CVE-2026-53869 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-53869?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53869, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-53869

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