Vulnerability in Kludex Starlette
CVE-2025-62727
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 FileRespons…
EPSS: 0.001 (21.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Kludex Starlette — versions >= 0.39.0, < 0.49.1
Weakness classification (CWE)
References
- https://github.com/Kludex/starlette/security/advisories/GHSA-7f5h-v6xp-fcq8 (x_refsource_CONFIRM)
- https://github.com/Kludex/starlette/commit/4ea6e22b489ec388d6004cfbca52dd5b147127c5 (x_refsource_MISC)
- https://github.com/Kludex/starlette/commit/69ed26a85956ef4bd0161807eb27abf49be7cd3c (x_refsource_MISC)
- https://github.com/Kludex/starlette/releases/tag/0.49.1 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-62727?
- CVE-2025-62727 is a high-severity vulnerability in Kludex Starlette, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2025-10-28.
- How severe is CVE-2025-62727?
- High severity. CVSS v3 base score is 7.5 out of 10.