CVEvulnerability
CVE-2025-62727
7.5 HIGH
Official page ↗
- Status
- Deferred
- Published
- 2025-10-28
- Last modified
- 2026-10-08
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-407
Description
Starlette is a lightweight ASGI framework/toolkit. Starting in version 0.39.0 and prior to version 0.49.1 , an unauthenticated attacker can send a crafted HTTP Range header that triggers quadratic-time processing in Starlette's FileResponse Range parsing/merging logic. This enables CPU exhaustion per request, causing denial‑of‑service for endpoints serving files (e.g., StaticFiles or any use of FileResponse). This vulnerability is fixed in 0.49.1.
Related
Weakness · CWE (1)
- CWE-407 Inefficient Algorithmic Complexity weakness
References
- https://github.com/Kludex/starlette/commit/4ea6e22b489ec388d6004cfbca52dd5b147127c5 github.com
- https://github.com/Kludex/starlette/commit/69ed26a85956ef4bd0161807eb27abf49be7cd3c github.com
- https://github.com/Kludex/starlette/releases/tag/0.49.1 github.com
- https://github.com/Kludex/starlette/security/advisories/GHSA-7f5h-v6xp-fcq8 github.com
- https://github.com/Kludex/starlette/security/advisories/GHSA-7f5h-v6xp-fcq8 github.com