Public mode

No access to your tenant or devices. Every item links to its source. What this means

CVE-2026-55205

Hermes WebUI < 0.51.468 - Resource Exhaustion via Unauthenticated OAuth Flow Endpoint

CVSS 4.0 6.9 MEDIUMCVSS 3.1 5.3 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-55205

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-55205

Published

hermes-webui

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "nesquena",
                    "product": "hermes-webui",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:github/nesquena/hermes-webui",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "0.51.468"
                        },
                        {
                            "version": "0.51.468",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ],
                    "repo": "https://github.com/nesquena/hermes-webui"
                }

Original source record · Cite this exact observation · Complete original publisher JSON