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CVE-2026-49955— Hermes WebUI < 0.51.270 Resource Exhaustion via passkey/options

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.

Hermes Web UI是Nathan Esquenazi个人开发者的一个轻量级、暗色主题的自主智能体Web界面。 Hermes Web UI 0.51.270之前版本存在安全漏洞，该漏洞源于资源耗尽问题，可能导致未经身份验证的远程攻击者通过重复调用passkey options端点降低服务可用性。

CVSS 5.3 · Medium EPSS 0.78% · P54

Affected Version Matrix 1

VendorProduct Version RangeStatus
nesquena hermes-webui < 0.51.270 affected
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I. Basic Information for CVE-2026-49955

Vulnerability Information
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Vulnerability Title
Hermes WebUI < 0.51.270 Resource Exhaustion via passkey/options
Source: CVE Program / CVE List V5
Vulnerability Description
Hermes WebUI before version 0.51.270 contains a resource exhaustion vulnerability that allows unauthenticated remote attackers to degrade service availability by repeatedly calling the passkey options endpoint without completing assertion. Attackers can send unlimited POST requests to the authentication endpoint, causing unbounded growth of the challenge store file and excessive CPU and disk I/O through repeated JSON file rewrites.
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
Hermes Web UI 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hermes Web UI是Nathan Esquenazi个人开发者的一个轻量级、暗色主题的自主智能体Web界面。 Hermes Web UI 0.51.270之前版本存在安全漏洞，该漏洞源于资源耗尽问题，可能导致未经身份验证的远程攻击者通过重复调用passkey options端点降低服务可用性。
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 ~ 0.51.270 -

II. Public POCs for CVE-2026-49955

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III. Intelligence Information for CVE-2026-49955

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Patches & Fixes for CVE-2026-49955 (1)

Vendor Advisories for CVE-2026-49955 (1)

Other References for CVE-2026-49955 (1)

Same Patch Batch · nesquena · 2026-06-09 · 5 CVEs total

CVE-2026-49959 8.8 HIGH Hermes WebUI < 0.51.311 RCE via Git Configuration Injection
CVE-2026-49957 7.7 HIGH Hermes WebUI < 0.51.296 Workspace Boundary Bypass via api/workspace.py
CVE-2026-49956 6.5 MEDIUM Hermes WebUI < 0.51.269 Profile Isolation Bypass via sessions search
CVE-2026-49958 5.0 MEDIUM Hermes WebUI < 0.51.303 TOCTOU Race Condition via git_discard

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-49955

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