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PYSEC-2026-1942 Starlette vulnerable to O(n^2) DoS via Range header merging in ``starlette.responses.FileResponse``

🗓️ 07 Jul 2026 16:03:08Reported by GoogleType 
osv
 osv🔗 osv.dev👁 6 Views

Starlette FileResponse is vulnerable to quadratic denial of service from crafted Range headers, exhausting CPU.

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IBM Security Bulletins		Security Bulletin: IBM watsonx.data integration has several vulnerabilities due to open source packages (CVE-2025-62727, CVE-2025-58754)
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07 Jul 2026 17:47Current
6.5Medium risk
Vulners AI Score6.5
CVSS 3.17.5
EPSS0.00638
starlette file responserange headerstatic filesdenial of service
6