Bug 2406929 (CVE-2025-62727) - CVE-2025-62727 starlette: Starlette DoS via Range header merging
Summary: CVE-2025-62727 starlette: Starlette DoS via Range header merging
Keywords:
Status: NEW
Alias: CVE-2025-62727
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-10-28 21:01 UTC by OSIDB Bzimport
Modified: 2025-10-28 21:47 UTC (History)
57 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2025-10-28 21:01:36 UTC 
Starlette is a lightweight ASGI framework/toolkit. Prior to 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.
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