CVE-2026-55205CWE-770denial-of-service

CVE-2026-55205

Medium · published June 18, 2026

CVSS v3.1
5.3
EPSS
1%
Percentile
43.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00524 · 43.6th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-06-18T21:16Z
References (6)
https://github.com/nesquena/hermes-webui/commit/ce272d9cd5f8e5a4521278f56eb5388010901646 · [email protected]https://github.com/nesquena/hermes-webui/pull/3970 · [email protected]https://github.com/nesquena/hermes-webui/pull/4338 · [email protected]https://github.com/nesquena/hermes-webui/releases/tag/v0.51.468 · [email protected]https://www.vulncheck.com/advisories/hermes-webui-resource-exhaustion-via-unauthenticated-oauth-flow-endpoint · [email protected]https://github.com/nesquena/hermes-webui/pull/3970 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 18 JUN 15:49Z
    Hermes WebUI < 0.51.468 - Resource Exhaustion via Unauthenticated OAuth Flow Endpoint
    cvelistv5