CVE-2026-55205: Allocation of Resources Without Limits or Throttling in nesquena hermes-webui
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.
AI Analysis
Technical Summary
CVE-2026-55205 describes a resource exhaustion vulnerability in nesquena's Hermes WebUI prior to version 0.51.468. The issue exists in the unauthenticated POST /api/onboarding/oauth/start endpoint, where attackers can cause unbounded accumulation of in-memory flow state and daemon threads. This can exhaust server memory and thread resources, potentially causing repeated outbound device-code requests to OAuth providers. No official remediation or patch is currently confirmed.
Potential Impact
Exploitation of this vulnerability can lead to denial of service conditions by exhausting server memory and thread resources. Additionally, it may cause repeated outbound requests to OAuth providers, which could affect upstream services or lead to further operational issues. There is no indication of privilege escalation or data disclosure from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider implementing rate limiting or request throttling on the affected endpoint to mitigate resource exhaustion risks. Monitor for unusual request patterns targeting the /api/onboarding/oauth/start endpoint.
CVE-2026-55205: Allocation of Resources Without Limits or Throttling in nesquena hermes-webui
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.
CVSS v4.0
Score 6.9medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-55205 describes a resource exhaustion vulnerability in nesquena's Hermes WebUI prior to version 0.51.468. The issue exists in the unauthenticated POST /api/onboarding/oauth/start endpoint, where attackers can cause unbounded accumulation of in-memory flow state and daemon threads. This can exhaust server memory and thread resources, potentially causing repeated outbound device-code requests to OAuth providers. No official remediation or patch is currently confirmed.
Potential Impact
Exploitation of this vulnerability can lead to denial of service conditions by exhausting server memory and thread resources. Additionally, it may cause repeated outbound requests to OAuth providers, which could affect upstream services or lead to further operational issues. There is no indication of privilege escalation or data disclosure from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider implementing rate limiting or request throttling on the affected endpoint to mitigate resource exhaustion risks. Monitor for unusual request patterns targeting the /api/onboarding/oauth/start endpoint.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-16T15:53:37.765Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a341e85f198dc38c11fcf5c
Added to database: 6/18/2026, 4:36:21 PM
Last enriched: 6/18/2026, 4:50:49 PM
Last updated: 6/18/2026, 7:49:21 PM
Views: 6
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