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CVE-2026-45554— NiceGUI: Unauthenticated log-flood DoS via trailing slash on ESM and per-component resource routes

Quick assessment

Affected
zauberzeug nicegui
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.

NiceGUI是NiceGUI开源的一个易于使用、基于 Python 的 UI 框架。 NiceGUI 3.12.0之前版本存在安全漏洞，该漏洞源于两个FastAPI路由接受子路径参数解析到目录，可能导致远程攻击者放大日志量并消耗磁盘和日志管道容量。

CVSS 5.3 · Medium EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
zauberzeug nicegui < 3.12.0 affected
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I. Basic Information for CVE-2026-45554

Vulnerability Information
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Vulnerability Title
NiceGUI: Unauthenticated log-flood DoS via trailing slash on ESM and per-component resource routes
Source: CVE Program / CVE List V5
Vulnerability Description
NiceGUI is a Python-based UI framework. Prior to version 3.12.0, two FastAPI routes that serve per-component static assets in NiceGUI accept a sub-path parameter that may resolve to a directory rather than a file. Requests that resolve to a directory raise an unhandled RuntimeError inside Starlette's FileResponse, which Uvicorn writes to the server log as a full traceback. Because the routes are reachable without authentication, a remote attacker can amplify log volume and consume disk and log-pipeline capacity on any publicly reachable NiceGUI server. This issue has been patched in version 3.12.0.
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
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
NiceGUI 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NiceGUI是NiceGUI开源的一个易于使用、基于 Python 的 UI 框架。 NiceGUI 3.12.0之前版本存在安全漏洞，该漏洞源于两个FastAPI路由接受子路径参数解析到目录，可能导致远程攻击者放大日志量并消耗磁盘和日志管道容量。
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
zauberzeug nicegui < 3.12.0 -

II. Public POCs for CVE-2026-45554

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III. Intelligence Information for CVE-2026-45554

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Vendor Advisories for CVE-2026-45554 (1)

Vendor Pages for CVE-2026-45554 (1)

IV. Related Vulnerabilities

Same product: nicegui
Same vendor: zauberzeug
Same weakness: CWE-248

V. Comments for CVE-2026-45554

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