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CVE-2026-55205— Hermes WebUI < 0.51.468 - Resource Exhaustion via Unauthenticated OAuth Flow Endpoint

Quick assessment

Affected
nesquena hermes-webui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

nesquena hermes-webui是nesquena的消息队列组件。 Nathan Esquenazi Hermes Web UI 0.51.468之前版本存在资源管理错误漏洞，该漏洞源于未经身份验证的POST /api/onboarding/oauth/start端点存在资源耗尽漏洞，可能导致攻击者通过发送重复或并发请求耗尽服务器内存和线程资源，并可能触发向上游OAuth提供商重复发送出站设备代码请求。

CVSS 5.3 · Medium EPSS 0.52% · P43

Affected Version Matrix 2

VendorProduct Version RangeStatus
nesquena hermes-webui < 0.51.468 affected
0.51.468 unaffected
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I. Basic Information for CVE-2026-55205

Vulnerability Information
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Vulnerability Title
Hermes WebUI < 0.51.468 - Resource Exhaustion via Unauthenticated OAuth Flow Endpoint
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Nathan Esquenazi Hermes Web UI 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nesquena hermes-webui是nesquena的消息队列组件。 Nathan Esquenazi Hermes Web UI 0.51.468之前版本存在资源管理错误漏洞，该漏洞源于未经身份验证的POST /api/onboarding/oauth/start端点存在资源耗尽漏洞，可能导致攻击者通过发送重复或并发请求耗尽服务器内存和线程资源，并可能触发向上游OAuth提供商重复发送出站设备代码请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nesquena hermes-webui 0 ~ 0.51.468 -

II. Public POCs for CVE-2026-55205

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III. Intelligence Information for CVE-2026-55205

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Patches & Fixes for CVE-2026-55205 (3)

Vendor Advisories for CVE-2026-55205 (1)

Other References for CVE-2026-55205 (1)

IV. Related Vulnerabilities

Same product: hermes-webui
Same vendor: nesquena
Same weakness: CWE-770

V. Comments for CVE-2026-55205

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