CVE-2025-62727
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-62727
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-62727.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2025-62727
- Aliases
- Downstream
- Related
- Published
- 2025-10-28T20:14:53.655Z
- Modified
- 2025-12-02T20:17:35.282773Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- Starlette vulnerable to O(n^2) DoS via Range header merging in starlette.responses.FileResponse
- Details
-
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.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-407" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/62xxx/CVE-2025-62727.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/62xxx/CVE-2025-62727.json
- https://github.com/Kludex/starlette/commit/4ea6e22b489ec388d6004cfbca52dd5b147127c5
- https://github.com/Kludex/starlette/commit/69ed26a85956ef4bd0161807eb27abf49be7cd3c
- https://github.com/Kludex/starlette/releases/tag/0.49.1
- https://github.com/Kludex/starlette/security/advisories/GHSA-7f5h-v6xp-fcq8
- https://nvd.nist.gov/vuln/detail/CVE-2025-62727