CVE-2026-55205

Medium

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductNesquena Hermes-webui

PublishedJun 18, 2026

First seenJun 18, 2026

Weakness typeCWE-770Allocation of resources without limits

How to fix

Update

nesquena hermes-webui0.51.468 or later

Patches

Vendor advisories

github.com/nesquena/hermes-webui/releases/tag/v0.51.468

Affected products

Product	Affected versions	Fixed in
nesquena hermes-webui	v < 0.51.468	0.51.468

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