CVE-2026-45554 json
NiceGUI: Unauthenticated log-flood DoS via trailing slash on ESM and per-component resource routes
published 2026-05-18 5 mo ago modified 2026-07-22 3 mo ago also GHSA-pq7c-x8g4-rvp6 , PYSEC-2026-2680 , EUVD-2026-33965
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 28%
- public exploits
- 0
- none known
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.34% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| OSV | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | nicegui | <3.12.0 |
3.12.0 |
Affected products
- zauberzeug nicegui
Classification
References
-
github.com
/zauberzeug/nicegui/security/advisories/GHSA-pq7c-x8g4-rvp6
web
-
github.com
/zauberzeug/nicegui/releases/tag/v3.12.0
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-45554
advisory
-
github.com
/zauberzeug/nicegui
package
-
pypi.org
/project/nicegui
package
-
github.com
/advisories/GHSA-pq7c-x8g4-rvp6
advisory
Sources
- CVE List CVE-2026-45554
- GitHub Advisory GHSA-pq7c-x8g4-rvp6
- NVD CVE-2026-45554
- OSV PYSEC-2026-2680
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