starlette: Starlette is a lightweight ASGI framework/toolkit
CVE-2025-62727 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2025-62727, released October 28, 2025. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-starlette · opensuse-leap 16.0 | 0.41.3-160000.3.1 | OPENSUSE-SU-2026:20975-1 | Jun 17, 2026 |
| python-starlette · sles 16.0 | 0.41.3-160000.3.1 | SUSE-SU-2026:22151-1 | Jun 17, 2026 |
| starlette · Debian 13.5 (trixie) | 0.46.1-3+deb13u1 | DEBIAN-CVE-2025-62727 | Oct 28, 2025 |
| starlette · Debian 14 | 0.50.0-1 | DEBIAN-CVE-2025-62727 | Oct 28, 2025 |
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