Hermes WebUI before 0.51.468 contains a resource exhaustion vulnerability in the unauthenticated POST /api/onboarding/oauth/start endpoint that allows unbounded accumulation of in-memory flow state and daemon threads. Attackers can send repeated or concurrent requests to exhaust server memory and thread resources, potentially triggering repeated outbound device-code requests to upstream OAuth providers.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00524.

Exploitation poc

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Get-hermes Subscribe
Hermes Web Ui Subscribe
Nesquena Subscribe
Hermes-webui Subscribe

No data.

No data.

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Vendors Products
Nesquena Subscribe
Hermes-webui Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/nesquena/hermes-webui/commit/ce272d9cd5f8e5a4521278f56eb5388010901646 cve-icon cve-icon
https://github.com/nesquena/hermes-webui/pull/3970 cve-icon cve-icon cve-icon
https://github.com/nesquena/hermes-webui/pull/4338 cve-icon cve-icon
https://github.com/nesquena/hermes-webui/releases/tag/v0.51.468 cve-icon cve-icon
https://www.vulncheck.com/advisories/hermes-webui-resource-exhaustion-via-unauthenticated-oauth-flow-endpoint cve-icon cve-icon
History

Tue, 14 Jul 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared Get-hermes
Get-hermes hermes Web Ui
CPEs cpe:2.3:a:get-hermes:hermes_web_ui:*:*:*:*:*:*:*:*
Vendors & Products Get-hermes
Get-hermes hermes Web Ui

Thu, 18 Jun 2026 21:15:00 +0000

Type Values Removed Values Added
First Time appeared Nesquena
Nesquena hermes-webui
Vendors & Products Nesquena
Nesquena hermes-webui

Thu, 18 Jun 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 18 Jun 2026 16:45:00 +0000

Type Values Removed Values Added
Description Hermes WebUI before 0.51.468 contains a resource exhaustion vulnerability in the unauthenticated POST /api/onboarding/oauth/start endpoint that allows unbounded accumulation of in-memory flow state and daemon threads. Attackers can send repeated or concurrent requests to exhaust server memory and thread resources, potentially triggering repeated outbound device-code requests to upstream OAuth providers.
Title Hermes WebUI < 0.51.468 - Resource Exhaustion via Unauthenticated OAuth Flow Endpoint
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-17T18:57:22.939Z

Reserved: 2026-06-16T15:53:37.765Z

Link: CVE-2026-55205

cve-icon Vulnrichment

Updated: 2026-06-18T17:36:27.901Z

cve-icon NVD

Status : Deferred

Published: 2026-06-18T17:16:34.767

Modified: 2026-09-17T18:16:49.510

Link: CVE-2026-55205

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-18T21:00:13Z

Weaknesses