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CVE-2026-33332— NiceGUI's unvalidated chunk size parameter in media routes can cause memory exhaustion

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 3.9.0之前版本存在安全漏洞，该漏洞源于app.add_media_file()和app.add_media_files()媒体路由接受未经验证的用户控制查询参数，可能导致攻击者绕过分块流式传输并强制服务器将整个文件加载到内存，进而导致内存消耗过度、性能下降或拒绝服务。

AI Predicted 5.3 Difficulty: Easy EPSS 0.69% · P52
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I. Basic Information for CVE-2026-33332

Vulnerability Information
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Vulnerability Title
NiceGUI's unvalidated chunk size parameter in media routes can cause memory exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
NiceGUI is a Python-based UI framework. Prior to version 3.9.0, NiceGUI's app.add_media_file() and app.add_media_files() media routes accept a user-controlled query parameter that influences how files are read during streaming. The parameter is passed to the range-response implementation without validation, allowing an attacker to bypass chunked streaming and force the server to load entire files into memory at once. With large media files and concurrent requests, this can lead to excessive memory consumption, degraded performance, or denial of service. This issue has been patched in version 3.9.0.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
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 3.9.0之前版本存在安全漏洞，该漏洞源于app.add_media_file()和app.add_media_files()媒体路由接受未经验证的用户控制查询参数，可能导致攻击者绕过分块流式传输并强制服务器将整个文件加载到内存，进而导致内存消耗过度、性能下降或拒绝服务。
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 < 3.9.0 -

II. Public POCs for CVE-2026-33332

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III. Intelligence Information for CVE-2026-33332

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Patches & Fixes for CVE-2026-33332 (1)

Vendor Advisories for CVE-2026-33332 (1)

Vendor Pages for CVE-2026-33332 (1)

IV. Related Vulnerabilities

Same product: nicegui
Same vendor: zauberzeug
Same weakness: CWE-20

V. Comments for CVE-2026-33332

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