Vulnerability 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 Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/nesquena/hermes-webui/commit/ce272d9cd5f8e5a4521278f56eb53880
- https://github.com/nesquena/hermes-webui/pull/3970
- https://github.com/nesquena/hermes-webui/pull/4338
- https://github.com/nesquena/hermes-webui/releases/tag/v0.51.468
- https://www.vulncheck.com/advisories/hermes-webui-resource-exhaustion-via-unauth
- https://github.com/nesquena/hermes-webui/pull/3970
FAQ
What is CVE-2026-55205?
CVE-2026-55205 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 an...
How severe is CVE-2026-55205?
CVE-2026-55205 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55205?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.