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CVE-2026-45553

NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()

Published: Jun 2, 2026Updated: Jun 2, 2026 Sources: CVE List
NVD MITRE
7.5CVSS
HIGH

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None

Weaknesses

CWE-200CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Affected Products

nicegui
zauberzeug

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://github.com/zauberzeug/nicegui/security/advisories/GHSA-jfrm-rx66-g536
github.com
https://github.com/zauberzeug/nicegui/releases/tag/v3.12.0
github.com

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