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CVE-2026-45553— NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()

Quick assessment

Affected
zauberzeug nicegui
Exploitation
Public or AI PoC available; prioritize validation
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之前版本存在信息泄露漏洞，该漏洞源于ui.restructured_text()未禁用文件插入指令，可能导致攻击者读取本地文件。

CVSS 7.5 · High EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
zauberzeug nicegui < 3.12.0 affected
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I. Basic Information for CVE-2026-45553

Vulnerability Information
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Vulnerability Title
NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()
Source: CVE Program / CVE List V5
Vulnerability Description
NiceGUI is a Python-based UI framework. Prior to version 3.12.0, ui.restructured_text() renders reStructuredText server-side with Docutils without disabling file insertion directives. When a NiceGUI application passes attacker-controlled content to ui.restructured_text(), an attacker can use standard Docutils directives (include, csv-table with :file:, raw with :file:) to read local files readable by the NiceGUI server process. Applications that only pass trusted static strings to ui.restructured_text() are not affected. 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:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
NiceGUI 信息泄露漏洞
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之前版本存在信息泄露漏洞，该漏洞源于ui.restructured_text()未禁用文件插入指令，可能导致攻击者读取本地文件。
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-2026-45553

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 5592 chars
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III. Intelligence Information for CVE-2026-45553

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Vendor Advisories for CVE-2026-45553 (1)

Vendor Pages for CVE-2026-45553 (1)

IV. Related Vulnerabilities

Same product: nicegui
Same vendor: zauberzeug
Same weakness: CWE-200

V. Comments for CVE-2026-45553

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