Medium
NiceGUI: Unauthenticated log-flood DoS via trailing slash on ESM and per-component resource routes
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-45554
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 12:52 UTC · Revision 1
Source evidence
NiceGUI: Unauthenticated log-flood DoS via trailing slash on ESM and per-component resource routes
core-osv · Original sourcePublished 2 Jun 2026, 15:35 UTC
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.
osv:CVE-2026-45554
Complete source record
{
"id": "be260037412c7319eea3a8b1affd91440b43962c5c01653039015d81f3b86416",
"url": "https://osv.dev/vulnerability/CVE-2026-45554",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "NiceGUI: Unauthenticated log-flood DoS via trailing slash on ESM and per-component resource routes",
"summary": "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.",
"evidence": "osv:CVE-2026-45554",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-45554",
"aliases": [
"CVE-2026-45554",
"GHSA-pq7c-x8g4-rvp6",
"PYSEC-2026-2680"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
}
],
"affected": [
{
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"modified": "2026-10-28T02:30:50.927431892Z",
"provider": "osv",
"references": [
"https://github.com/zauberzeug/nicegui/releases/tag/v3.12.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45554.json",
"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-pq7c-x8g4-rvp6",
"https://nvd.nist.gov/vuln/detail/CVE-2026-45554"
],
"provider_metadata": {
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"CWE-770"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45554.json"
}
},
"related_cves": [
{
"value": "CVE-2026-45554",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 519347,
"published_at": "2026-06-02T15:35:07.125+00:00"
}