High
NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-45553
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 11:00 UTC · Revision 1
Source evidence
NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()
core-osv · Original sourcePublished 2 Jun 2026, 15:34 UTC
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.
osv:CVE-2026-45553
Complete source record
{
"id": "aa59f7470cb671d29785087f94b4e4125ee89f525e6f271c9a85d7604e5d3606",
"url": "https://osv.dev/vulnerability/CVE-2026-45553",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()",
"summary": "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.",
"evidence": "osv:CVE-2026-45553",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-45553",
"aliases": [
"CVE-2026-45553",
"GHSA-jfrm-rx66-g536",
"PYSEC-2026-2679"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
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"type": "GIT",
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],
"modified": "2026-10-28T02:30:28.174115169Z",
"provider": "osv",
"references": [
"https://github.com/zauberzeug/nicegui/releases/tag/v3.12.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45553.json",
"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-jfrm-rx66-g536",
"https://nvd.nist.gov/vuln/detail/CVE-2026-45553"
],
"provider_metadata": {
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],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45553.json"
}
},
"related_cves": [
{
"value": "CVE-2026-45553",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 494784,
"published_at": "2026-06-02T15:34:39.897+00:00"
}