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CVE-2025-62727

HIGH

7.5

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.

Details CVE

Score CVSS v3.17.5

SeveriteHIGH

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurNONE

Publie10/28/2025

Derniere modification11/4/2025

Sourcenvd

Observations honeypot0

Faiblesses (CWE)

CWE-407

References

https://github.com/Kludex/starlette/commit/4ea6e22b489ec388d6004cfbca52dd5b147127c5(security-advisories@github.com)

https://github.com/Kludex/starlette/commit/69ed26a85956ef4bd0161807eb27abf49be7cd3c(security-advisories@github.com)

https://github.com/Kludex/starlette/releases/tag/0.49.1(security-advisories@github.com)

https://github.com/Kludex/starlette/security/advisories/GHSA-7f5h-v6xp-fcq8(security-advisories@github.com)

https://github.com/Kludex/starlette/security/advisories/GHSA-7f5h-v6xp-fcq8(134c704f-9b21-4f2e-91b3-4a467353bcc0)

Correlations IOC

Aucune correlation enregistree

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