CVE-2026-55205

MEDIUM EPSS 21.7%
Published Jun 18, 20262w ago · Modified Jun 22, 20261w ago
6.9 CVSS 4.0
Medium
Find Similar
Published Jun 18, 2026 2w ago
Last Modified Jun 22, 2026 1w ago

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 Details

Base Score
6.9
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
21.7% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-770

References 5

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.