{"id":"CVE-2026-45554","aliases":["GHSA-pq7c-x8g4-rvp6","PYSEC-2026-2680"],"url":"https://o3.security/vulnerability/CVE-2026-45554","summary":"NiceGUI: Unauthenticated log-flood DoS via trailing slash on ESM and per-component resource routes","details":"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.","published":"2026-06-02T15:35:07.125Z","modified":"2026-08-12T03:51:08.182950901Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":{"score":0.00343,"percentile":0.27333,"asOf":"2026-08-15"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"nicegui","fixedVersion":"3.12.0"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/zauberzeug/nicegui/releases/tag/v3.12.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45554.json"},{"type":"ADVISORY","url":"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-pq7c-x8g4-rvp6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45554"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:08.182950901Z"}}