CVE-2026-53869

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.5HIGHmedium confidence
EG Risk
38
EG Risk 38/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation1% × 40%
Automatability30% × 15%
EPSS PROB
0.8%
EPSS %ILE
55th
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 rangeFix by version rangeDependents
hermes-agent0.13.0, 0.14.0, 0.15.0, 0.15.1, 0.15.2
  • every version up to 0.16.0: fixed in 0.16.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 25× 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.

Showing the most recent 100 of 152 total refreshes for this CVE.

  1. 2026-10-06 15:18 UTCEPSS rescore
  2. 2026-10-05 17:43 UTCEPSS rescore
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  1. 2026-09-07 16:01 UTCEPSS rescore
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  74. 2026-07-19 02:29 UTCEPSS rescore
  75. 2026-07-18 10:04 UTCEPSS rescore

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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 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 0.8% probability of exploitation in the next 30 days (55th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53869?
CVE-2026-53869 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53869?
A fix for CVE-2026-53869 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53869 are linked in the Vendor Advisories panel on this page.

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